Ashworth Mountain Black Walnut Seeds

Ashworth Mountain Black Walnut Seeds—50 Seeds: Ships ASAP

$50.00

Reliable shipping

Flexible returns

Pollination Plant two or more

Bloom group 4 of 7 (Mid)

Walnut & Heartnut Pollination Chart

Ripening

Will it finish before your first hard freeze?

Check it on the Ripening Map (opens in a new tab)

Disease resistanceResists 1 of 4

Anthracnose : Susceptible, 2 of 5
Butternut canker : Resistant, 4 of 5
Thousand cankers disease : Highly susceptible, 1 of 5
Walnut blight : Moderate, 3 of 5

Scored 1 to 5. Higher resists better, and ? means no published data yet.

See it on our nut tree disease chart (opens in a new tab)

At a glance: Ashworth Mountain Black Walnut Seeds—50 Seeds: Ships ASAP seed, rated hardy to zone 3 in our ratings (winters to -40°F), and wind-pollinated with staggered male and female bloom, so plant two different trees.

Hardy to	Zone 3 to 9. A bare number means the whole of zone 3, colder half included (winters to -40°F). Find your zone with our cold hardiness calculator.
Chill hours	About 1,100 hours (800 to 1,500). Seedlings vary, so this is based on the parent tree. Montana winters give it plenty. In milder climates, make sure your winters average at least this much. Check your chill hours or see our sources.
Pollination	Heterodichogamous - Plant Two Different Trees. Bloom group 4 of 7 (mid), late spring to early summer here. Black walnut trees often shed pollen and receive it at different times, so plant at least two seedlings (more is better) for good nut set. Bloom group is our estimate from the variety's origin and relatives. Walnut & Heartnut Pollination Chart.
Good for	Wood (9/10), pies and baking (8/10), edible nuts (6/10), feeding wildlife (6/10). Scores are our own 1 to 10 ratings; 8 and up makes our Best Of lists.
What you get	50 Ashworth Mountain black walnut seeds. Ships ASAP.

From the largest planting of Black Walnut in the Missoula Valley. The original ten trees were planted in the 1980’s. They were seedlings from Fred Ashworth’s trees and so a good amount of work had already been done to improve cold hardiness, nut production and timber quality. A second generation was planted by squirrels over the last 50 years. This selection is from the 2nd generation and exhibits productivity and a decent amount of nut meat for a Missoula Black Walnut (2-3g per nut with limited irrigation). With two generations of proven Montana parents, this next generation should be very cold hardy and well adapted to Montana’s climate. Zone 3.

Questions we get about Ashworth Mountain Black Walnut Seeds—50 Seeds: Ships ASAP

How cold hardy is Ashworth Mountain Black Walnut Seeds—50 Seeds: Ships ASAP?

We rate Ashworth Mountain Black Walnut Seeds—50 Seeds: Ships ASAP hardy to zone 3, which means winters down to about -40°F. Our ratings come from real winters at our two Montana sites and from trusted growers across the North, not from a catalog average.

How many chill hours does Ashworth Mountain Black Walnut Seeds—50 Seeds: Ships ASAP need?

About 1,100 hours of winter chill (we count hours at or below 45°F), likely somewhere between 800 and 1,500. Seedlings vary, so that's based on the parent trees, Missoula black walnuts descended from Fred Ashworth's trees. Black walnut cultivars tested at about 1,100 hours. The nuts also need cold, moist stratification to sprout. Our chill hours guide has a calculator for your winters, and our research page lists the sources.

What is Ashworth Mountain Black Walnut Seeds—50 Seeds: Ships ASAP good for?

Our top use scores for Ashworth Mountain Black Walnut Seeds—50 Seeds: Ships ASAP are wood (9/10), pies and baking (8/10), edible nuts (6/10), feeding wildlife (6/10). Anything scored 8 or higher makes our Best Of lists.

What arrives, and when does it ship?

50 Ashworth Mountain black walnut seeds, shipped as soon as you order.

Is Ashworth Mountain Black Walnut disease resistant?

For some diseases, yes. It's resistant to butternut canker. It holds up moderately well against walnut blight. It's very prone to thousand cankers disease, and prone to anthracnose. Our nut tree disease resistance chart has every rating, the notes and the sources.

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Garden & Seeds Seeds

Not available for spring 2027. Here's what we'd plant instead.

Ashworth Mountain Black Walnut Seeds—50 Seeds: Ships ASAP is off the list this season. These are in stock now, and the full seeds collection has the rest. Everything on our zone 3 page is rated for the same winters.