Cotinus coggygria Scop. is a plant of the genus Astragalus of the family Isatis. Also known as Huang Daoyu, Huang Yucai.
ã€Characteristics】 Small deciduous trees or shrubs, up to 8 meters. The crown is round and the bark is dark grayish brown without cracking. Branchlets purple-brown, wax powder. Leaves alternate, broadly ovate, apex rounded or slightly concave, entire, petiole slender. Flowers small, miscellaneous, yellow-green. As for the terminal panicle, after the early summer flower, the purple-green feather-shaped slender peduncle of most sterile flowers is present. Stone kidney shape. Flowering from April to May, fruit ripening period from June to July.
[variations, variants, and varieties]
(1) var. purpurens Rehd.: The leaves are purple all year round.
(3) var.pendula Dipp.: Crowned umbrella. Branches droop.
(4) var. cinerea: The ovary umbrella is obovate, with hairs on both sides, especially below.
Geographical distribution is produced in North China, Northwest China, Southwest China, and West Asia and Southern Europe. In recent years, the area has been introduced and cultivated, with few applications.
Ecological habits: Positive trees. The ability to resist half yin, cold and drought. It is also resistant to thin and alkaline soils. Not wet, should be planted in deep, fertile and well-drained sandy loam. Fast growth, strong shade. The root system is developed, but less hate. When the temperature difference between day and night is greater than 10°C in autumn, the leaf color turns red.
ã€Pests and diseases】mainly include downy mildew and powdery mildew.
ã€Cultivation and cultivation】The main breeding method is seeding and breeding. It can also be used for squashing, rooting and ramets. Seed weight of 9 to 12 grams, about 8 to 11 million per kilogram, germination rate of 50% to 70%. With sowing or early spring sowing, soaking treatment is required. The seeding rate per acre is 3~4 kg, and the annual seedling height is more than 1 meter. Because of its less fibrous roots, the branches should be strongly pruned during transplantation to maintain the balance of the tree potential and be beneficial to survival. Huangqi is easy to cultivate and its management is simple and extensive. Trunk distortion, should be cut at a young age, choose to stay long branches, in order to form a straight tree.
ã€Afforestation Uses】 Huangqi is an important ornamental red-leaf tree species. The sterilized flowers of infertile flowers that remain long after flowering are pink feather-like and form a dreamlike landscape with cloud-like fog on the branches. It is also a good tree species for afforestation. In this area, due to the small temperature difference between day and night, the color effect is not obvious.
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