How do walnuts grow seedlings?

Walnuts are mainly propagated through grafting. The rootstock is a 1-2 year old seedling of this stock or iron walnut. First, store the seed sand layer for more than 60 days and remove it for sowing at the beginning of spring. The row spacing of drilling is 30-40 centimeters, the plant spacing is 12-15 centimeters, and the soil cover is about 5 centimeters. When sowing, the suture line of the seed should be perpendicular to the ground, which is conducive to the smooth growth of the embryonic roots and buds. The suitable period for branch grafting is between the beginning of spring and the rain, preferably when the sap begins to flow and the top buds of the rootstock have already sprouted. The suitable period for bud grafting is around the spring equinox, when the rootstock begins to shoot and before the top bud spreads its leaves, and when the bark is easily peeled off, it is more suitable. After grafting, both the interface and scion are covered in plastic bags and wrapped with damp sawdust for insulation, resulting in a grafting survival rate of over 95%. Using walnut cotyledon seedlings for grafting, when the seed buds are about to display true leaves, cut off the rootstock buds at a distance of 1 centimeter on the cotyledon stem and split them. After grafting, place them in a healing pool or a simple greenhouse, and transplant them to the field after survival. The survival rate is over 80%, which can shorten the seedling raising time.

Thin shell hickory can also be raised by root cutting. The roots of 1-4 year old seedlings with a thickness of 1-5 centimeters can be cut into 10 centimeters long. Winter and spring cuttings have a high survival rate and can also be propagated by methods such as tillering, layering, cutting, and grafting. Walnuts have fewer lateral roots, and the main root should be cut off during the seedling stage to promote lateral roots and improve the survival rate of planting. The planting density is 210-285 plants/h 2. Both spring and autumn can be planted. Due to the fact that walnut flowers are hermaphroditic and require cross pollination, pollination trees should be provided.