{"title":"European Plum Trees","description":"\u003cp\u003eEuropean plums are the prune and blue plums: firm, sweet, freestone fruit that's great fresh, dried, baked or canned. They bloom later than the hybrid plums and pollenize each other, not the Japanese-American hybrids.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/products\/italian-plum\"\u003eItalian Plum\u003c\/a\u003e is the classic prune plum, hardy to zone 3b and partially self-fertile. \u003ca href=\"\/products\/mount-royal-plum\"\u003eMount Royal\u003c\/a\u003e is the tough one, hardy to zone 2b and self-fertile, so it's the pick for really cold sites.\u003c\/p\u003e\u003cp\u003eRelated: \u003ca href=\"\/collections\/plum-trees\"\u003eAll Plum Trees\u003c\/a\u003e · \u003ca href=\"\/collections\/hybrid-plum-trees\"\u003eJapanese-American Hybrid Plums\u003c\/a\u003e · \u003ca href=\"\/collections\/zone-3-plum-trees\"\u003eZone 3 Plum Trees\u003c\/a\u003e · \u003ca href=\"\/collections\/disease-resistant-plum-trees\"\u003eDisease-Resistant Plums\u003c\/a\u003e · \u003ca href=\"\/pages\/plum-pollination-map\"\u003ePlum Pollination Map\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"italian-plum","title":"Italian Plum (Spring 2027)","description":"\u003cdiv class=\"mft-facts\"\u003e\n\u003cp\u003e\u003cstrong\u003eAt a glance:\u003c\/strong\u003e Italian Plum is a plum tree rated hardy to zone 3b in our ratings (winters to -35°F), partially self-fertile, so a second variety nearby makes crops more dependable (bloom group 4 of 7, mid for a European plum), and it ripens about Sep 9 to Sep 29 in Missoula (our Missoula estimate).\u003c\/p\u003e\n\u003ctable class=\"mft-facts-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eHardy to\u003c\/th\u003e\n\u003ctd\u003eZone 3b to 8. The b means the warmer half of zone 3 only (winters to -35°F). Our notes have it taking -25°F. Find your zone with our \u003ca href=\"\/pages\/cold-hardiness-calculator\"\u003ecold hardiness calculator\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"mft-chill\"\u003e\n\u003cth\u003eChill hours\u003c\/th\u003e\n\u003ctd\u003eAbout 800 hours (700 to 1,000). Well documented. Independent sources agree. Montana winters give it plenty. In milder climates, make sure your winters average at least this much. \u003ca href=\"\/pages\/chill-hours\"\u003eCheck your chill hours\u003c\/a\u003e or \u003ca href=\"\/pages\/chill-hours-research#italian-plum\"\u003esee our sources\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePollination\u003c\/th\u003e\n\u003ctd\u003ePartially Self-Fertile. Bloom group 4 of 7 (mid), mid spring here. Italian sets fruit alone but crops better with another European plum such as Stanley or Mount Royal. It will not cross with Asian or \u003ca href=\"\/products\/native-american-plum-bundle-of-2\"\u003eAmerican plums\u003c\/a\u003e. Nearby varieties that can boost the crop: \u003ca href=\"\/products\/stanley-plum\"\u003eStanley Plum\u003c\/a\u003e, \u003ca href=\"\/products\/mount-royal-plum\"\u003eMount Royal Plum\u003c\/a\u003e, \u003ca href=\"\/products\/early-italian-plum\"\u003eEarly Italian Plum\u003c\/a\u003e, \u003ca href=\"\/products\/longjohn-plum\"\u003eLongjohn Plum\u003c\/a\u003e and 6 more. \u003ca href=\"\/pages\/plum-pollination-map\"\u003ePlum Pollination Map\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRipens\u003c\/th\u003e\n\u003ctd\u003eAbout Sep 9 to Sep 29 in Missoula (a Missoula estimate from published sources). Real years swing about a week either way. \u003ca href=\"\/pages\/ripening-map\"\u003eSee the date for your town\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRootstock and size\u003c\/th\u003e\n\u003ctd\u003eLovell: full size, about 12 to 20 ft tall unpruned. Doesn't like wet feet or high-lime soil. \u003ca href=\"\/pages\/rootstocks\"\u003eOur rootstock guide\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGood for\u003c\/th\u003e\n\u003ctd\u003eDrying (10\/10), pies and baking (9\/10), cooking and roasting (9\/10), sauce and butter (8\/10), canning and freezing (8\/10), fresh eating (7\/10). Scores are our own 1 to 10 ratings; 8 and up makes our Best Of lists.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDeer\u003c\/th\u003e\n\u003ctd\u003eA deer favorite. Fence it or cage it.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWhat you get\u003c\/th\u003e\n\u003ctd\u003eBare root, 4-6 ft. - One Year Older or 6-8 ft. Shipped or picked up in Missoula in spring, roots wrapped in moist sawdust. Guaranteed to bud out.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3 data-start=\"84\" data-end=\"98\"\u003eOverview\u003c\/h3\u003e\n\u003cp data-start=\"99\" data-end=\"372\"\u003eOne of the most reliable European plums in Western Montana, Italian offers excellent flavor. This large, purple-skinned, freestone plum is super flavorful and very sweet when fully ripe. In Missoula, we wait until the frost gets them before harvesting, as it softens and sweetens the fruit. But don't do leave it on the tree for many consecutive evenings of frost because it will then become bland. \u003c\/p\u003e\n\u003ch3 data-start=\"374\" data-end=\"394\"\u003eVersatile Uses\u003c\/h3\u003e\n\u003cp data-start=\"395\" data-end=\"505\"\u003eItalian plums can be eaten fresh, dried, or cooked, making them a versatile addition to any garden or kitchen.\u003c\/p\u003e\n\u003ch3 data-start=\"507\" data-end=\"545\"\u003eCold Hardiness and Growing Zones\u003c\/h3\u003e\n\u003cp data-start=\"546\" data-end=\"833\"\u003eA vigorous and fairly cold-hardy plum, Italian is perfect for most areas in Western Montana, unless you're in one of the colder areas (i.e. Potomac). It’s recommended for Zone 4 and it survived -25°F in Missoula on 1\/13\/24 without showing any signs of injury. Italian's limit, however, in terms of absolute extreme winter low tolerance is likely to -35°F, possibly -40°F if planted in a good area free of frost pooling.\u003c\/p\u003e\n\u003ch3 data-start=\"835\" data-end=\"871\"\u003eSelf-Fertility and Pollination\u003c\/h3\u003e\n\u003cp data-start=\"872\" data-end=\"1127\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eItalian is partially self-fertile and doesn’t require a pollenizer, though it may fruit more abundantly when planted alongside varieties like President, \u003ca href=\"\/products\/stanley-plum\"\u003eStanley\u003c\/a\u003e, \u003ca href=\"\/products\/mirabelle-de-bitterroot-plum-bundle-of-2\"\u003eMirabelle de Bitterroot\u003c\/a\u003e, or others. It will not cross-pollinate with Asian or \u003ca href=\"\/products\/native-american-plum-bundle-of-2\"\u003eAmerican plums\u003c\/a\u003e.\u003c\/p\u003e\n\u003cdiv class=\"mft-faq\"\u003e\n\u003ch3\u003eQuestions we get about Italian Plum\u003c\/h3\u003e\n\u003ch4\u003eDoes Italian Plum need a pollenizer?\u003c\/h4\u003e\n\u003cp\u003eIt helps. Italian Plum is partially self-fertile, so it can set some fruit alone, but a second variety nearby makes crops more dependable. Italian sets fruit alone but crops better with another European plum such as \u003ca href=\"\/products\/stanley-plum\"\u003eStanley\u003c\/a\u003e or \u003ca href=\"\/products\/mount-royal-plum\"\u003eMount Royal\u003c\/a\u003e. It will not cross with Asian or \u003ca href=\"\/products\/native-american-plum-bundle-of-2\"\u003eAmerican plums\u003c\/a\u003e. Partners we carry include Stanley Plum, Mount Royal Plum, \u003ca href=\"\/products\/early-italian-plum\"\u003eEarly Italian Plum\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch4\u003eHow cold hardy is Italian Plum?\u003c\/h4\u003e\n\u003cp\u003eWe rate Italian Plum hardy to zone 3b, which means winters down to about -35°F. Our notes have it taking -25°F. Our ratings come from real winters at our two Montana sites and from trusted growers across the North, not from a catalog average.\u003c\/p\u003e\n\u003ch4\u003eHow many chill hours does Italian Plum need?\u003c\/h4\u003e\n\u003cp\u003eAbout 800 hours of winter chill (we count hours at or below 45°F), likely somewhere between 700 and 1,000. That figure is well documented: independent sources agree. Nurseries list 700 to 1,000 hours, most often 800. It blooms late, which helps it dodge spring frost. Our \u003ca href=\"\/pages\/chill-hours\"\u003echill hours guide\u003c\/a\u003e has a calculator for your winters, and our \u003ca href=\"\/pages\/chill-hours-research#italian-plum\"\u003eresearch page\u003c\/a\u003e lists the sources.\u003c\/p\u003e\n\u003ch4\u003eWhen does Italian Plum ripen?\u003c\/h4\u003e\n\u003cp\u003eAbout Sep 9 to Sep 29 in Missoula, Montana (an estimate built from published sources and our climate). Warmer places run earlier and cooler places later; our ripening map converts the date to your town.\u003c\/p\u003e\n\u003ch4\u003eHow big does Italian Plum get?\u003c\/h4\u003e\n\u003cp\u003eWe graft Italian Plum onto Lovell (full size), which makes a tree roughly 12 to 20 ft tall if you never prune it.\u003c\/p\u003e\n\u003ch4\u003eWhat is Italian Plum good for?\u003c\/h4\u003e\n\u003cp\u003eOur top use scores for Italian Plum are drying (10\/10), pies and baking (9\/10), cooking and roasting (9\/10), sauce and butter (8\/10). Anything scored 8 or higher makes our Best Of lists.\u003c\/p\u003e\n\u003ch4\u003eWill deer eat Italian Plum?\u003c\/h4\u003e\n\u003cp\u003eYes, deer love it. Protect Italian Plum with a fence or a cage, especially while it is young.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Montana Fruit Trees","offers":[{"title":"Lovell Full Size: 4-6 ft. - One Year Older (Less Branching than 6-8 ft.) Pruned to 5 ft. for Shipping","offer_id":42751573327938,"sku":null,"price":74.99,"currency_code":"USD","in_stock":false},{"title":"Lovell Full Size: 6-8 ft. (One Year Older) Pruned to 5 ft. for shipping","offer_id":42499268542530,"sku":null,"price":109.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0626\/5687\/2514\/files\/italian-plum-on-tree.png?v=1789020347"},{"product_id":"mirabelle-de-bitterroot-plum-bundle-of-2","title":"Mirabelle de Bitterroot Plum (Bundle of 2) | Spring 2027","description":"\u003cdiv class=\"mft-facts\"\u003e\n\u003cp\u003e\u003cstrong\u003eAt a glance:\u003c\/strong\u003e Mirabelle de Bitterroot Plum is a plum tree rated hardy to zone 3b in our ratings (winters to -35°F), and not self-fertile, so it needs a different variety nearby as a pollenizer (bloom group 4 of 7, mid for a European plum).\u003c\/p\u003e\n\u003ctable class=\"mft-facts-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eHardy to\u003c\/th\u003e\n\u003ctd\u003eZone 3b to 8. The b means the warmer half of zone 3 only (winters to -35°F). Find your zone with our \u003ca href=\"\/pages\/cold-hardiness-calculator\"\u003ecold hardiness calculator\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"mft-chill\"\u003e\n\u003cth\u003eChill hours\u003c\/th\u003e\n\u003ctd\u003eAbout 800 hours (700 to 1,100). Our estimate. No published figure exists for this variety yet. Montana winters give it plenty. In milder climates, make sure your winters average at least this much. \u003ca href=\"\/pages\/chill-hours\"\u003eCheck your chill hours\u003c\/a\u003e or \u003ca href=\"\/pages\/chill-hours-research#mirabelle-de-bitterroot-plum-bundle-of-2\"\u003esee our sources\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePollination\u003c\/th\u003e\n\u003ctd\u003eNeeds Cross-Pollination. Bloom group 4 of 7 (mid), mid spring here. Self-fertility is unknown for this local selection, so plant another European plum such as Stanley, Italian or Mount Royal nearby. Japanese and hybrid plums (\u003ca href=\"\/products\/toka-plum\"\u003eToka\u003c\/a\u003e, \u003ca href=\"\/products\/superior-plum\"\u003eSuperior\u003c\/a\u003e, \u003ca href=\"\/products\/la-crescent-plum\"\u003eLa Crescent\u003c\/a\u003e, \u003ca href=\"\/products\/ptitsin-5-plum\"\u003ePtitsin #5\u003c\/a\u003e and the like) cannot pollenize it. Good partners we carry: \u003ca href=\"\/products\/stanley-plum\"\u003eStanley Plum\u003c\/a\u003e, \u003ca href=\"\/products\/mount-royal-plum\"\u003eMount Royal Plum\u003c\/a\u003e, \u003ca href=\"\/products\/italian-plum\"\u003eItalian Plum\u003c\/a\u003e, \u003ca href=\"\/products\/early-italian-plum\"\u003eEarly Italian Plum\u003c\/a\u003e and 6 more. Bloom group is our estimate from the variety's origin and relatives. \u003ca href=\"\/pages\/plum-pollination-map\"\u003ePlum Pollination Map\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGood for\u003c\/th\u003e\n\u003ctd\u003eJams and jellies (8\/10), fresh eating (7\/10), pies and baking (7\/10), brandy and liqueurs (7\/10), canning and freezing (7\/10), sauce and butter (7\/10). Scores are our own 1 to 10 ratings; 8 and up makes our Best Of lists.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDeer\u003c\/th\u003e\n\u003ctd\u003eA deer favorite. Fence it or cage it.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWhat you get\u003c\/th\u003e\n\u003ctd\u003eBare root, 3-5 ft. or 5-7 ft. (pruned to 5 ft. for shipping). Shipped or picked up in Missoula in spring, roots wrapped in moist sawdust. Guaranteed to bud out.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3 data-start=\"4612\" data-end=\"4626\"\u003eOverview\u003c\/h3\u003e\n\u003cp data-start=\"4627\" data-end=\"4948\"\u003eIf anyone has ever been to Europe and tried Mirabelle plums there, then the genetics of these plums are the most comparable, but specifically for cold-climate growers. The mother plants were discovered growing wild by Luke in the Bitterroot Mountains of Montana. He propagated them and named them Mirabelle de Bitterroot.\u003c\/p\u003e\n\u003ch3 data-start=\"4950\" data-end=\"4970\"\u003eFlavor Profile\u003c\/h3\u003e\n\u003cp data-start=\"4971\" data-end=\"5121\"\u003eThe plums are roughly the same size as the French Mirabelles and have a very similar sweet, jammy flavor, with some subtle notes of apricot and honey.\u003c\/p\u003e\n\u003ch3 data-start=\"5123\" data-end=\"5143\"\u003eCold Hardiness\u003c\/h3\u003e\n\u003cp data-start=\"5144\" data-end=\"5351\"\u003eThese plums are hardy down to -35°F, if not even hardier. The mother trees of these roots have survived for over 60 years, enduring intense fall frosts, mid-winter lows, and the generally tough Montana cold.\u003c\/p\u003e\n\u003cdiv class=\"mft-faq\"\u003e\n\u003ch3\u003eQuestions we get about Mirabelle de Bitterroot Plum\u003c\/h3\u003e\n\u003ch4\u003eDoes Mirabelle de Bitterroot Plum need a pollenizer?\u003c\/h4\u003e\n\u003cp\u003eYes. Mirabelle de Bitterroot Plum needs pollen from a different variety that blooms at about the same time. Self-fertility is unknown for this local selection, so plant another European plum such as \u003ca href=\"\/products\/stanley-plum\"\u003eStanley\u003c\/a\u003e, \u003ca href=\"\/products\/italian-plum\"\u003eItalian\u003c\/a\u003e or \u003ca href=\"\/products\/mount-royal-plum\"\u003eMount Royal\u003c\/a\u003e nearby. Japanese and hybrid plums (\u003ca href=\"\/products\/toka-plum\"\u003eToka\u003c\/a\u003e, \u003ca href=\"\/products\/superior-plum\"\u003eSuperior\u003c\/a\u003e, \u003ca href=\"\/products\/la-crescent-plum\"\u003eLa Crescent\u003c\/a\u003e, \u003ca href=\"\/products\/ptitsin-5-plum\"\u003ePtitsin #5\u003c\/a\u003e and the like) cannot pollenize it. Partners we carry include Stanley Plum, Mount Royal Plum, Italian Plum.\u003c\/p\u003e\n\u003ch4\u003eHow cold hardy is Mirabelle de Bitterroot Plum?\u003c\/h4\u003e\n\u003cp\u003eWe rate Mirabelle de Bitterroot Plum hardy to zone 3b, which means winters down to about -35°F. Our ratings come from real winters at our two Montana sites and from trusted growers across the North, not from a catalog average.\u003c\/p\u003e\n\u003ch4\u003eHow many chill hours does Mirabelle de Bitterroot Plum need?\u003c\/h4\u003e\n\u003cp\u003eAbout 800 hours of winter chill (we count hours at or below 45°F), likely somewhere between 700 and 1,100. Nobody has published a chill figure for it, so that's our estimate from its relatives and origin. Our \u003ca href=\"\/pages\/chill-hours\"\u003echill hours guide\u003c\/a\u003e has a calculator for your winters, and our \u003ca href=\"\/pages\/chill-hours-research#mirabelle-de-bitterroot-plum-bundle-of-2\"\u003eresearch page\u003c\/a\u003e lists the sources.\u003c\/p\u003e\n\u003ch4\u003eWhat is Mirabelle de Bitterroot Plum good for?\u003c\/h4\u003e\n\u003cp\u003eOur top use scores for Mirabelle de Bitterroot Plum are jams and jellies (8\/10), fresh eating (7\/10), pies and baking (7\/10), brandy and liqueurs (7\/10). Anything scored 8 or higher makes our Best Of lists.\u003c\/p\u003e\n\u003ch4\u003eWill deer eat Mirabelle de Bitterroot Plum?\u003c\/h4\u003e\n\u003cp\u003eYes, deer love it. Protect Mirabelle de Bitterroot Plum with a fence or a cage, especially while it is young.\u003c\/p\u003e\n\u003ch4\u003eWhat arrives, and when does Mirabelle de Bitterroot Plum ship?\u003c\/h4\u003e\n\u003cp\u003eA dormant bare-root plant, roots wrapped in moist sawdust with a vapor barrier, shipped or picked up in Missoula in spring. Sizes offered: \u003cmeta charset=\"utf-8\"\u003eBare root, 3-5 ft. or 5-7 ft. (pruned to 5 ft. for shipping). We guarantee our plants bud out. Stone fruits can be slow, so if one still has not budded out by August 15, write to us and we credit you for the following spring.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Montana Fruit Trees","offers":[{"title":"3-5 ft.","offer_id":42500879777858,"sku":null,"price":99.99,"currency_code":"USD","in_stock":true},{"title":"5-7 ft. (pruned to 5 ft. for shipping)","offer_id":42500879843394,"sku":null,"price":139.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0626\/5687\/2514\/files\/mirabelle-de-bitterroot-plum-on-tree.webp?v=1789020605"},{"product_id":"mount-royal-plum","title":"Mount Royal Plum (Spring 2027)","description":"\u003cdiv class=\"mft-facts\"\u003e\n\u003cp\u003e\u003cstrong\u003eAt a glance:\u003c\/strong\u003e Mount Royal Plum is a plum tree rated hardy to zone 2b in our ratings (winters to -45°F), self-fertile, so one tree can crop (bloom group 4 of 7, mid for a European plum), and it ripens about Aug 31 to Sep 12 in Missoula (our Missoula estimate).\u003c\/p\u003e\n\u003ctable class=\"mft-facts-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eHardy to\u003c\/th\u003e\n\u003ctd\u003eZone 2b to 7. The b means the warmer half of zone 2 only (winters to -45°F). Our notes have it taking -44°F. Find your zone with our \u003ca href=\"\/pages\/cold-hardiness-calculator\"\u003ecold hardiness calculator\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"mft-chill\"\u003e\n\u003cth\u003eChill hours\u003c\/th\u003e\n\u003ctd\u003eAbout 800 hours (700 to 1,000). Our estimate. No published figure exists for this variety yet. Montana winters give it plenty. In milder climates, make sure your winters average at least this much. \u003ca href=\"\/pages\/chill-hours\"\u003eCheck your chill hours\u003c\/a\u003e or \u003ca href=\"\/pages\/chill-hours-research#mount-royal-plum\"\u003esee our sources\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePollination\u003c\/th\u003e\n\u003ctd\u003eSelf-Fertile. Bloom group 4 of 7 (mid), mid spring here. Mount Royal is self-fertile and fruits as a single tree. It is also a good pollenizer for other European plums. Nearby varieties that can boost the crop: \u003ca href=\"\/products\/stanley-plum\"\u003eStanley Plum\u003c\/a\u003e, \u003ca href=\"\/products\/italian-plum\"\u003eItalian Plum\u003c\/a\u003e, \u003ca href=\"\/products\/early-italian-plum\"\u003eEarly Italian Plum\u003c\/a\u003e, \u003ca href=\"\/products\/longjohn-plum\"\u003eLongjohn Plum\u003c\/a\u003e and 6 more. Bloom group is our estimate from the variety's origin and relatives. \u003ca href=\"\/pages\/plum-pollination-map\"\u003ePlum Pollination Map\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRipens\u003c\/th\u003e\n\u003ctd\u003eAbout Aug 31 to Sep 12 in Missoula (a Missoula estimate from published sources). Real years swing about a week either way. \u003ca href=\"\/pages\/ripening-map\"\u003eSee the date for your town\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRootstock and size\u003c\/th\u003e\n\u003ctd\u003eNative Plum: semi-dwarf, about 10 to 15 ft tall unpruned. Suckers, so mow or pull suckers. Prairie Red Plum: semi-dwarf, about 10 to 15 ft tall unpruned. A seed-grown American plum hybrid from the USDA plant materials center in Bismarck; it suckers. \u003ca href=\"\/pages\/rootstocks\"\u003eOur rootstock guide\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGood for\u003c\/th\u003e\n\u003ctd\u003eFresh eating (8\/10), jams and jellies (7\/10), canning and freezing (7\/10), drying (7\/10), cooking and roasting (7\/10), sauce and butter (7\/10). Scores are our own 1 to 10 ratings; 8 and up makes our Best Of lists.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDeer\u003c\/th\u003e\n\u003ctd\u003eA deer favorite. Fence it or cage it.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWhat you get\u003c\/th\u003e\n\u003ctd\u003eBare root, 3-5 ft or 5-7 ft. Shipped or picked up in Missoula in spring, roots wrapped in moist sawdust. Guaranteed to bud out.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eMount Royal plum has been a reliable European plum variety for northern growers. It is an upright to spreading tree with an open center and moderate vigor.\u003c\/p\u003e\n\u003ch3\u003eFlavor and Uses\u003c\/h3\u003e\n\u003cp\u003eThe light blue plums are juicy, semi-freestone, and have sweet flesh. They are excellent for fresh eating, okay for drying, and ripen in late August to early September.\u003c\/p\u003e\n\u003ch3\u003eCold Hardiness\u003c\/h3\u003e\n\u003cp\u003eMount Royal has survived temperatures as low as -44°F in West Central MN and -42°F in Columbus, MT, proving its hardiness in extreme conditions. UPDATE FALL 2025: We just discovered that Mount Royal has survived and borne a consistent crop in Lodgepole, Montana at \u003ca href=\"https:\/\/agresearch.montana.edu\/warc\/research_current\/msu-ext-fruit-research-sites\/lodge_pole.html\"\u003eMSU's Lodgepole Fruit Research Site,\u003c\/a\u003e where it has gotten down to sub -45F temps.\u003c\/p\u003e\n\u003ch3\u003eRootstock and Cold Tolerance\u003c\/h3\u003e\n\u003cp\u003eOur Mount Royal plums are grafted onto Native Plum and \u003ca href=\"\/products\/prairie-red-plum-bundle-of-2\"\u003ePrairie Red Plum\u003c\/a\u003e, both of which are hardy to at least -50F. Native Plum is semi-dwarf in our MT climate\/soils, although we have found that there is some natural variation in size, as these plants are grown from seed. Prairie Red, meanwhile, exhibits less variation in size according to what Dan Sheild has observed at his site in MN.\u003c\/p\u003e\n\u003cp style=\"font-size:12px;color:#777;margin-top:24px\"\u003ePhotos: “Fruits du prunier Mont-Royal (Prunus domestica 'Mont-Royal')” by Maxime Laterreur, via \u003ca href=\"https:\/\/commons.wikimedia.org\/wiki\/File:Fruits_du_prunier_Mont-Royal_(Prunus_domestica_%27Mont-Royal%27).jpg\" target=\"_blank\" rel=\"nofollow noopener\"\u003eWikimedia Commons\u003c\/a\u003e, licensed \u003ca href=\"https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\" target=\"_blank\" rel=\"nofollow noopener\"\u003eCC BY-SA 4.0\u003c\/a\u003e; “Fleurs du prunier Mont-Royal (Prunus domestica 'Mont-Royal')” by Maxime Laterreur, via \u003ca href=\"https:\/\/commons.wikimedia.org\/wiki\/File:Fleurs_du_prunier_Mont-Royal_(Prunus_domestica_%27Mont-Royal%27).jpg\" target=\"_blank\" rel=\"nofollow noopener\"\u003eWikimedia Commons\u003c\/a\u003e, licensed \u003ca href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\" target=\"_blank\" rel=\"nofollow noopener\"\u003eCC BY 4.0\u003c\/a\u003e.\u003c\/p\u003e\n\u003cdiv class=\"mft-faq\"\u003e\n\u003ch3\u003eQuestions we get about Mount Royal Plum\u003c\/h3\u003e\n\u003ch4\u003eDoes Mount Royal Plum need a pollenizer?\u003c\/h4\u003e\n\u003cp\u003eNo. Mount Royal Plum is self-fertile, so a single tree can set fruit. Mount Royal is self-fertile and fruits as a single tree. It is also a good pollenizer for other European plums. Partners we carry include \u003ca href=\"\/products\/stanley-plum\"\u003eStanley Plum\u003c\/a\u003e, \u003ca href=\"\/products\/italian-plum\"\u003eItalian Plum\u003c\/a\u003e, \u003ca href=\"\/products\/early-italian-plum\"\u003eEarly Italian Plum\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch4\u003eHow cold hardy is Mount Royal Plum?\u003c\/h4\u003e\n\u003cp\u003eWe rate Mount Royal Plum hardy to zone 2b, which means winters down to about -45°F. Our notes have it taking -44°F. Our ratings come from real winters at our two Montana sites and from trusted growers across the North, not from a catalog average.\u003c\/p\u003e\n\u003ch4\u003eHow many chill hours does Mount Royal Plum need?\u003c\/h4\u003e\n\u003cp\u003eAbout 800 hours of winter chill (we count hours at or below 45°F), likely somewhere between 700 and 1,000. Nobody has published a chill figure for it, so that's our estimate from its relatives and origin. Our \u003ca href=\"\/pages\/chill-hours\"\u003echill hours guide\u003c\/a\u003e has a calculator for your winters, and our \u003ca href=\"\/pages\/chill-hours-research#mount-royal-plum\"\u003eresearch page\u003c\/a\u003e lists the sources.\u003c\/p\u003e\n\u003ch4\u003eWhen does Mount Royal Plum ripen?\u003c\/h4\u003e\n\u003cp\u003eAbout Aug 31 to Sep 12 in Missoula, Montana (an estimate built from published sources and our climate). Warmer places run earlier and cooler places later; our ripening map converts the date to your town.\u003c\/p\u003e\n\u003ch4\u003eHow big does Mount Royal Plum get?\u003c\/h4\u003e\n\u003cp\u003eWe graft Mount Royal Plum onto Native Plum (semi-dwarf), which makes a tree roughly 10 to 15 ft tall if you never prune it. Some sizes are on \u003ca href=\"\/products\/prairie-red-plum-bundle-of-2\"\u003ePrairie Red Plum\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch4\u003eWhat is Mount Royal Plum good for?\u003c\/h4\u003e\n\u003cp\u003eOur top use scores for Mount Royal Plum are fresh eating (8\/10), jams and jellies (7\/10), canning and freezing (7\/10), drying (7\/10). Anything scored 8 or higher makes our Best Of lists.\u003c\/p\u003e\n\u003ch4\u003eWill deer eat Mount Royal Plum?\u003c\/h4\u003e\n\u003cp\u003eYes, deer love it. Protect Mount Royal Plum with a fence or a cage, especially while it is young.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Montana Fruit Trees","offers":[{"title":"Native Plum Semi-Dwarf: 3-5 ft.","offer_id":42500896686146,"sku":null,"price":49.99,"currency_code":"USD","in_stock":true},{"title":"Prairie Red Plum Semi-Dwarf: 3-5 ft.","offer_id":45134015365186,"sku":null,"price":49.99,"currency_code":"USD","in_stock":true},{"title":"Native Plum Semi-Dwarf: 3-5 ft.(One Year Older) Pruned to 5 ft. for Shipping","offer_id":45134015397954,"sku":null,"price":59.99,"currency_code":"USD","in_stock":true},{"title":"Prairie Red Plum Semi-Dwarf: 5-7 ft. (Pruned to 5 ft. for Shipping)","offer_id":45134015430722,"sku":null,"price":69.99,"currency_code":"USD","in_stock":true},{"title":"Native Plum Semi-Dwarf: 5-7 ft.(Pruned to 5 ft. for Shipping)","offer_id":45134015463490,"sku":null,"price":69.99,"currency_code":"USD","in_stock":true},{"title":"Native Plum Semi-Dwarf: 5-7 ft.(One Year Older) Pruned to 5 ft. for Shipping","offer_id":45134015496258,"sku":null,"price":89.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0626\/5687\/2514\/files\/mount-royal-plums-on-tree.jpg?v=1791616066"},{"product_id":"deluge-plum","title":"Deluge Plum (Spring 2027)","description":"\u003cdiv class=\"mft-facts\"\u003e\n\u003cp\u003e\u003cstrong\u003eAt a glance:\u003c\/strong\u003e Deluge Plum is a plum tree rated hardy to zone 3b in our ratings (winters to -35°F), not self-fertile, so it needs a different variety nearby as a pollenizer (bloom group 4 of 7, mid for a European plum), and it ripens about Aug 1 to Aug 14 in Missoula (picked and dated here).\u003c\/p\u003e\n\u003ctable class=\"mft-facts-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eHardy to\u003c\/th\u003e\n\u003ctd\u003eZone 3b to 8. The b means the warmer half of zone 3 only (winters to -35°F). Local trees have taken -30°F. Find your zone with our \u003ca href=\"\/pages\/cold-hardiness-calculator\"\u003ecold hardiness calculator\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"mft-chill\"\u003e\n\u003cth\u003eChill hours\u003c\/th\u003e\n\u003ctd\u003eAbout 800 hours (700 to 1,100). Our estimate. No published figure exists for this variety yet. Montana winters give it plenty. In milder climates, make sure your winters average at least this much. \u003ca href=\"\/pages\/chill-hours\"\u003eCheck your chill hours\u003c\/a\u003e or \u003ca href=\"\/pages\/chill-hours-research#deluge-plum\"\u003esee our sources\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePollination\u003c\/th\u003e\n\u003ctd\u003eNeeds Cross-Pollination. Bloom group 4 of 7 (mid), mid spring here. Plant another European plum such as Stanley or Mount Royal nearby. Its plum group is an educated guess, so noting its bloom date next to Stanley and \u003ca href=\"\/products\/toka-plum\"\u003eToka\u003c\/a\u003e would confirm the right partners. Good partners we carry: \u003ca href=\"\/products\/stanley-plum\"\u003eStanley Plum\u003c\/a\u003e, \u003ca href=\"\/products\/mount-royal-plum\"\u003eMount Royal Plum\u003c\/a\u003e, \u003ca href=\"\/products\/italian-plum\"\u003eItalian Plum\u003c\/a\u003e, \u003ca href=\"\/products\/early-italian-plum\"\u003eEarly Italian Plum\u003c\/a\u003e and 6 more. Bloom group is our estimate from the variety's origin and relatives. \u003ca href=\"\/pages\/plum-pollination-map\"\u003ePlum Pollination Map\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRipens\u003c\/th\u003e\n\u003ctd\u003eAbout Aug 1 to Aug 14 in Missoula (picked and dated here). Pick while still fairly firm, then follow the ripening directions below. Real years swing about a week either way. \u003ca href=\"\/pages\/ripening-map\"\u003eSee the date for your town\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRootstock and size\u003c\/th\u003e\n\u003ctd\u003ePrairie Red Plum: semi-dwarf, about 10 to 15 ft tall unpruned. A seed-grown American plum hybrid from the USDA plant materials center in Bismarck; it suckers. \u003ca href=\"\/pages\/rootstocks\"\u003eOur rootstock guide\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGood for\u003c\/th\u003e\n\u003ctd\u003eFresh eating (8\/10). Scores are our own 1 to 10 ratings; 8 and up makes our Best Of lists.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDeer\u003c\/th\u003e\n\u003ctd\u003eA deer favorite. Fence it or cage it.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWhat you get\u003c\/th\u003e\n\u003ctd\u003eBare root, 4-6 ft or 6-8 ft. Shipped or picked up in Missoula in spring, roots wrapped in moist sawdust. Guaranteed to bud out.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eA Missoula Landrace Plum\u003c\/h3\u003e\n\u003cp\u003eDeluge is a local Missoula landrace plum. Seedling plums of this type are scattered all over town, and this is the best tasting of those ilk. Discovered by James Sapp and selected by Luke Ruffner Robinson.\u003c\/p\u003e\n\u003ch3\u003eCold Hardiness\u003c\/h3\u003e\n\u003cp\u003eMany of these seedling plums are old enough to have been standing in Missoula through the 1980s, so they have been through the worst winters this valley has on record: -30°F in December 1983, -28°F in January 1979 and again in December 1990, and -27°F in February 1982, all measured at the Missoula airport. Cold air pools on the valley floor, so the trees in the low spots around town have likely seen a few degrees colder than the airport did. We rate Deluge hardy to zone 3b, to about -35°F. It has proven itself to -30°F.\u003c\/p\u003e\n\u003ch3\u003eHow to Pick and Ripen Deluge (Read This Part)\u003c\/h3\u003e\n\u003cp\u003eThese are really exceptional plums if you handle them right, and just ordinary plums if you don't. Here is what works:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePick them while they are still fairly firm. In Missoula that is the first to second week of August.\u003c\/li\u003e\n\u003cli\u003eLeave them out at room temperature for about a week, until they are slightly soft.\u003c\/li\u003e\n\u003cli\u003eThen move them to the refrigerator. They should keep for another 2 to 3 weeks in there.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWe found this out by accident. James Sapp dropped a batch off for us while we were out of town, and they sat outside for a week. Then a friend stopped by and put them in the fridge. When we got back into town we tried them, and they were wonderful. We would score them 8 out of 10, which on our scale is very good.\u003c\/p\u003e\n\u003cp\u003eThe following year, in 2026, we had them right after they were picked, when they were already somewhat soft, without that sitting period. They were not nearly as good. Same trees, same plums. Follow the directions above, because they are really exceptional when you do.\u003c\/p\u003e\n\u003cdiv class=\"mft-faq\"\u003e\n\u003ch3\u003eQuestions we get about Deluge Plum\u003c\/h3\u003e\n\u003ch4\u003eDoes Deluge Plum need a pollenizer?\u003c\/h4\u003e\n\u003cp\u003eYes. Deluge Plum needs pollen from a different variety that blooms at about the same time. Plant another European plum such as \u003ca href=\"\/products\/stanley-plum\"\u003eStanley\u003c\/a\u003e or \u003ca href=\"\/products\/mount-royal-plum\"\u003eMount Royal\u003c\/a\u003e nearby. Its plum group is an educated guess, so noting its bloom date next to Stanley and \u003ca href=\"\/products\/toka-plum\"\u003eToka\u003c\/a\u003e would confirm the right partners. Partners we carry include Stanley Plum, Mount Royal Plum, \u003ca href=\"\/products\/italian-plum\"\u003eItalian Plum\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch4\u003eHow cold hardy is Deluge Plum?\u003c\/h4\u003e\n\u003cp\u003eWe rate Deluge Plum hardy to zone 3b, which means winters down to about -35°F. Local trees have taken -30°F. Our ratings come from real winters at our two Montana sites and from trusted growers across the North, not from a catalog average.\u003c\/p\u003e\n\u003ch4\u003eHow many chill hours does Deluge Plum need?\u003c\/h4\u003e\n\u003cp\u003eAbout 800 hours of winter chill (we count hours at or below 45°F), likely somewhere between 700 and 1,100. Nobody has published a chill figure for it, so that's our estimate from its relatives and origin. A Missoula landrace European plum. Chill is estimated at about 800 hours, typical for European plums. Our \u003ca href=\"\/pages\/chill-hours\"\u003echill hours guide\u003c\/a\u003e has a calculator for your winters, and our \u003ca href=\"\/pages\/chill-hours-research#deluge-plum\"\u003eresearch page\u003c\/a\u003e lists the sources.\u003c\/p\u003e\n\u003ch4\u003eWhen does Deluge Plum ripen?\u003c\/h4\u003e\n\u003cp\u003eAbout Aug 1 to Aug 14 in Missoula, Montana, picked and dated off local trees. Pick them firm and let them sit a week at room temperature before refrigerating. Warmer places run earlier and cooler places later; our ripening map converts the date to your town.\u003c\/p\u003e\n\u003ch4\u003eHow big does Deluge Plum get?\u003c\/h4\u003e\n\u003cp\u003eWe graft Deluge Plum onto \u003ca href=\"\/products\/prairie-red-plum-bundle-of-2\"\u003ePrairie Red Plum\u003c\/a\u003e (semi-dwarf), which makes a tree roughly 10 to 15 ft tall if you never prune it.\u003c\/p\u003e\n\u003ch4\u003eWhat is Deluge Plum good for?\u003c\/h4\u003e\n\u003cp\u003eOur top use scores for Deluge Plum are fresh eating (8\/10). Anything scored 8 or higher makes our Best Of lists.\u003c\/p\u003e\n\u003ch4\u003eWill deer eat Deluge Plum?\u003c\/h4\u003e\n\u003cp\u003eYes, deer love it. Protect Deluge Plum with a fence or a cage, especially while it is young.\u003c\/p\u003e\n\u003ch4\u003eWhat arrives, and when does Deluge Plum ship?\u003c\/h4\u003e\n\u003cp\u003eA dormant bare-root plant, roots wrapped in moist sawdust with a vapor barrier, shipped or picked up in Missoula in spring. Sizes offered: 4-6 ft or 6-8 ft. We guarantee our plants bud out. Stone fruits can be slow, so if one still has not budded out by August 15, write to us and we credit you for the following spring.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Montana Fruit Trees","offers":[{"title":"Prairie Red Plum Semi-Dwarf: 4-6 ft. (Pruned to 5 ft. for Shipping)","offer_id":45177628786754,"sku":null,"price":59.99,"currency_code":"USD","in_stock":true},{"title":"Prairie Red Plum Semi-Dwarf: 6-8 ft. (Pruned to 5 ft. for Shipping)","offer_id":45177628819522,"sku":null,"price":79.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0626\/5687\/2514\/files\/deluge-plum-harvest.jpg?v=1789019844"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0626\/5687\/2514\/collections\/mount-royal-plums-on-tree_f32b5993-77d8-47aa-8967-949e26e59b11.jpg?v=1792787015","url":"https:\/\/www.montanafruittrees.com\/collections\/european-plum-trees.oembed","provider":"Montana Fruit Trees","version":"1.0","type":"link"}