The osmanthus varieties mentioned above are Jingui, Yin Gui and Dangui, which are collectively called Bagui. There is also a sweet-scented osmanthus that blooms all year round, called "Four Seasons Sweet-scented osmanthus".
In addition, according to different planting areas, the flowering time of osmanthus fragrans will be slightly different. Shanghai, Anhui and Jiangsu basically opened 5438+00 in June, Northeast China in August, Beijing, Tianjin and Hebei in September, and Sichuan, Guangxi and Shaanxi in September.
Extended data:
morphological character
Osmanthus fragrans is an evergreen tree or shrub, with a height of 3-5 meters and a maximum of 18 meters. The bark is grayish brown. Branchlets yellowish brown, glabrous. Leaf blade is leathery, oval, oblong or elliptic-lanceolate, 7- 14.5 cm long and 2.6-4.5 cm wide, the apex is tapered, the base is tapered into a wedge shape or a wide wedge shape, the whole edge or upper part is usually serrated, the two sides are hairless, the two sides of the gland point are connected with small blisters, the midvein is concave and convex, and the lateral veins are 6-8 pairs. The petiole is 0.8- 1.2 cm long, and the longest is 15 cm, without hair.
Cymes clustered in leaf axils, or nearly broom-shaped, with many flowers in each axil; Bracts broadly ovate, thick, 2-4 mm long, small at the top, glabrous; Pedicel slender, 4- 10 mm long, glabrous; These flowers are very fragrant; Calyx is about 65438 0 mm long with slightly irregular lobes; Corolla is yellowish white, light yellow, yellow or orange red, 3-4 mm long, and corolla tube is only 0.5- 1 mm long;
Stamens are inserted in the middle of corolla tube, filaments are very short, about 0.5 mm long, anthers are about 65438 0 mm long, connective extends slightly at the top of anthers, forming an inconspicuous small tip; The pistil is about 65438 0.5 mm long and the style is about 0.5 mm long. The fruit is skewed, oval, long 1- 1.5 cm, and purple-black. The flowering period is September-65438+1early October, and the fruiting period is March of the following year. ?
There are osmanthus fragrans with strong growth potential, thick branches, large leaf shape, rough leaves, dark green leaves and orange red leaves; There are silvery laurel trees with medium growth, smooth leaves, serrated leaves, milky white flowers and dense and sweet flowers;
Strong growth potential, smooth leaves, sparse serrated or whole leaves, light yellow flowers and sparse fragrance, which can bloom with the above varieties in September-June in autumn, or once every two or three months. Dangui and Sijigui, the fruit is purple-black drupe, commonly known as cinnamon. Osmanthus fragrans seedlings have obvious taproots, developed and deep roots. Young roots are yellow-brown, old roots are yellow-brown? .
growing environment
Osmanthus fragrans adapts to subtropical climate. Sexual preference is warm and humid. The average temperature in the planting area is 14-28℃, the average temperature in July is 24-28℃, the average temperature in June is above 0℃, the minimum temperature is-13℃, and the optimum growth temperature is 15-28℃. Humidity is very important for the growth and development of osmanthus fragrans. The annual average humidity is 75%-85%, and the annual precipitation is about 1 1,000 mm. Especially when young trees and adults bloom, they need more water. If there is drought, it will affect flowering, and strong sunshine and shade are not good for their growth. Generally they need 6-8 hours of light every day. ?
Osmanthus fragrans likes warmth, strong resistance, high temperature resistance and cold resistance. Therefore, it can overwinter in the open air in the areas south of Qinling Mountains and Huaihe River in China. Osmanthus fragrans likes sunshine, but also can resist shade. In full light, it has lush foliage and dense flowers. In the shade, its branches and leaves are sparse and flowers are scarce. If potted indoors in the north, it is especially necessary to pay attention to sufficient light to facilitate growth and flower bud formation.
Osmanthus fragrans is relatively humid, and it is forbidden to accumulate water, but it also has certain drought resistance. Osmanthus fragrans is not strict with the soil. Except alkaline soil and low-lying land or soil that is too sticky and poorly drained, it can generally grow, but slightly acidic sandy loam with deep soil layer, loose and fertile soil and good drainage is the most suitable. Osmanthus fragrans is resistant to chlorine, sulfur dioxide, hydrogen fluoride and other harmful gases, and has strong dust adsorption ability, so it is often used in cities and industrial and mining areas. ?
Osmanthus fragrans is suitable for planting in ventilated and light-transmitting places; I like a clean and ventilated environment, and I can't bear the harm of smoke and dust. I often can't blossom after being victimized. Afraid of waterlogging, if waterlogging damages, the root system will be black and rotten, the leaves will be scorched at the tip first, and then the whole leaves will wither and fall off, leading to the death of the whole plant; Not very cold-tolerant, but compared with other evergreen broad-leaved tree species, it is still a relatively cold-tolerant tree species. ?
References:
Osmanthus fragrans (common name for many trees of Oleaceae in China) _ Baidu Encyclopedia