 Fruit |
 Seed |
 Seedling |
Propagation Method
Seed collection: Black walnut fruits are technically drupes. They can be collected in the fall after they fall to the ground. Seeds are most easily removed from the outer fruit just after they fall to the ground by peeling away the outer layers to get at the hard seed that resembles a nut.
Seeds of black walnut should not be allowed to dry out. They can be stored for short periods (1 year) in air tight containers in the refrigerator if not allowed to dry out.
Seed dormancy: Black walnut has physiological dormancy.
Seed germination: Stratify seeds using moist chilling for 120 days to satisfy physiological dormancy. Following stratification, sow seeds in a nursery container to produce a seedling or sow them in a plastic container in the classroom to observe germination.