[Crowbob]

Black walnuts vs. English walnuts?

They both can be cultivated. English (actually from Asia) are what we all like. Blacks not so much.

Collect walnuts after they fall. Remove the hulls and then place the nuts in a glass of water. Nuts that float are not viable and can be thrown away (or eaten). Good, viable nuts will sink to the bottom of the glass.

The viable walnuts will need to stratify (i.e., be exposed to cold and moist conditions that mimic winter conditions underground). Stratification can be done by placing the nuts in a sandwich bag fill sand and peat mix with a few spritzes of water to moisten the mix and putting the bag in the veggie drawer in your fridge for 90-120 days. Alternatively, you can plant the nuts directly in the ground in the fall for a less controlled result.
After stratification, plant the nut two inches deep and wait for it to germinate.
Care for the sapling and wait eight years to collect your first harvest of walnuts.