Growth habit of walnut trees;
Sex loves warmth and fears frost. Walnut, born in the hilly area at an altitude of 400- 1800 meters, blooms in May and bears fruit in 10.
Sandy loam is fertile and moist, and is commonly found in deep soil on both sides of the valley. At present, agricultural planting is generally in low mountains and hills around 200 meters above sea level.
morphological character
The trunk types of walnut trees are different, the height is generally 2~ 10 meters, and the highest may be more than ten meters; Wide crown; Bark is grayish green when young, grayish white when old, and shallow vertically; Branchlets glabrous, shiny, peltate glands, grayish green, and later brownish.
Odd pinnate compound leaves are 25~30 cm long, and petiole and leaf axis have extremely short glandular hairs and glands when they are young; Leaflets are generally 5-9, and 3 are sparse. The oval walnut tree is oval or rectangular, with a length of 6- 15cm and a width of 3-6cm. The top is blunt or sharp, with a short cone, and the bottom is skewed and close to a circle. The serrations on the whole or young trees are sparse, the top is dark green, the bottom is hairless, and the light green lateral veins are 65438.
Male inflorescences droop, about 5~ 10 cm long and as thin as 15 cm. Bracts, bracteoles and perianth segments of male flowers have glandular hairs; Stamens 6~30, anthers yellow, glabrous. Female spike usually has 1~3(~4) female flowers. The involucre of female flowers is short glandular hairy, and the stigma is light green.
Short fruit sequence, 1~3 fruit; The fruit is nearly spherical, 4~6 cm in diameter and hairless; The stone is slightly wrinkled, with two longitudinal edges and a short tip; The diaphragm is thin and there is no gap inside; The endocarp wall has irregular gaps or no gaps, only wrinkles.