Sorbaria sorbifolia (scientific name: Sorbaria sorbifolia (L.) A. Br) is a shrub of the Rosaceae family, up to 2 meters high, with spreading branches; winter buds are oval, purple-brown, with blunt apex. , with several alternate and exposed scales. Pinnately compound leaves, leaflets opposite, lanceolate to ovate-lanceolate, apex acuminate, tail sparsely pointed, base nearly round or broadly wedge-shaped, sparsely oblique, edges sharp and heavily serrated, upper and lower sides hairless Or nearly hairless, with pinnate veins, stipule leaves, terminal large dense panicle, branches nearly upright, total pedicel and pedicel covered with stellate hairs or pubescence, gradually falling off during fruit period, bracts ovoid Lanceolate to linear-lanceolate, with long acuminate apex, entire margin or shallow teeth, slightly puberulent on both upper and lower surfaces, gradually falling off in fruit stage; calyx tube bell-shaped, sepals triangular-ovate, apex blunt or acutely pointed , the sepals are about as long as the calyx tube; the petals are oblong or obovate, white; the stamens are born on the edge of the disk; the carpel is hairless or slightly pubescent. The follicles are oblong with a terminal curved style. They bloom from July to August and bear fruit in September.

Distributed in Liaoning, Jilin, Heilongjiang, and Inner Mongolia, China. It is also distributed in the Soviet Union, North Korea, Japan, and Mongolia. It grows in sparse forests on hillside, at an altitude of 250-1500 meters.

The pearl plum tree is beautiful and blooms in summer. The flower buds are as white as pearls and the flower shape resembles plum blossoms. It has a long flowering period. The effect is particularly good when planted in the corners of the grass in the garden, in front of the window, behind the house or in the shade of the courtyard. It can also be used as a hedge or cut flower vase.

(Overview picture source: China Natural Herbarium) Basic introduction Chinese name: Pearl Plum Latin scientific name: Sorbaria sorbifolia (L.) A. Br. Alias: Mountain sorghum strips, Gao Kaizi, Babentiao (Northeastern soil name) Kingdom: Plant Kingdom Phylum: Angiosperms Class: Dicotyledons Subclass: Primitive Perianth Subclass: Rosales Suborder: Rosaceae Family: Rosaceae Subfamily: Spiraea subfamily Genus : Pearlberry genus and species: Pearlberry Named by: (L.) A. Br, 1864 Morphological characteristics, main varieties, origin and habitat, growth habits, reproduction methods, divisions, cuttings, layering, cultivation techniques, pest and disease control , leaf spot, powdery mildew, chafers, spotted leaf waxhopper, main value, gardening, medicinal, morphological characteristics shrub, up to 2 meters high, with spreading branches; branchlets are cylindrical, slightly buckled, hairless or slightly pubescent, Green at first, dark reddish brown or dark yellowish brown when old; winter buds are oval, with blunt apex, hairless or slightly pubescent at the apex, purplish brown, with several alternate exposed scales. Pinnately compound leaves, with 11-17 leaflets, 13-23 cm long and 10-13 cm wide with petiole, rachis slightly pubescent; leaflets opposite, 2-2.5 cm apart, lanceolate to ovate. Shape lanceolate, 5-7 cm long, 1.8-2.5 cm wide, apex acuminate, tail sparsely pointed, base nearly round or broadly wedge-shaped, sparsely oblique, edges sharp and heavily serrated, upper and lower sides hairless or nearly Hairless, pinnately reticulated, with 12-16 pairs of lateral veins, obvious below; leaflets sessile or nearly sessile; stipules leaf texture, ovate-lanceolate to triangular-lanceolate, apex acuminate to acute, The edges are irregularly serrated or entire, 8-13 mm long, 5-8 mm wide, and slightly pubescent outside. Terminal large dense panicle, branches nearly upright, 10-20 cm long, 5-12 cm in diameter, total pedicel and pedicel covered with stellate hairs or pubescence, gradually falling off during fruit period, almost hairless; bracts Oval-lanceolate to linear-lanceolate, 5-10 mm long, 3-5 mm wide, apex long and acuminate, entire margin or lightly toothed, upper and lower sides slightly pubescent, gradually falling off during fruit period; pedicel long 5-8 mm; flower diameter 10-12 mm; calyx tube bell-shaped, slightly pubescent at the outer base; sepals triangular-ovate, apex blunt or acute, sepals approximately as long as the calyx tube; petals oblong or obovate , 5-7 mm long, 3-5 mm wide, white; stamens 40-50, about 1.5-2 times longer than petals, borne on the edge of the disk; carpel 5, glabrous or slightly pubescent. The follicle is oblong, with a terminal curved style, about 3 mm long, and the fruit stem is erect; the sepals are persistent, reflexed, and sparsely unfolded. The flowering period is from July to August and the fruiting period is in September.

The main varieties of Pearlberry star hair variety Pearl Plum star hair variety Pearl plum star hair variety are also called star hairs, Catalpa pearla (Northeast Woody Plant Illustration) and spike-shaped seven-degree stove (Botany Dictionary). Their inflorescences and leaf rachis are dense. Covered with stellate hairs, the backs of leaves have sparse stellate hairs, and the fruits have sparse pubescence. Prolific in Jilin and Heilongjiang. It mostly grows in mountainous shrubs at an altitude of 250-300 meters. Distributed in Korea. A close relative of this species is the pearl plum. Originating from China, the type specimen was collected from plants cultivated in the Arboretum de Villimoulins, France. The difference between the dense-veined pearl plum and the pearl plum is that there are fewer stamens (20) and the small leaves have more than 25 pairs of lateral veins. However, the difference from North China Pearl Plum was not pointed out, and no type specimen was found. Origin and Habitat Distributed in Liaoning, Jilin, Heilongjiang, and Inner Mongolia, China. It is also distributed in the Soviet Union, North Korea, Japan, and Mongolia. It grows in sparse forests on hillside, at an altitude of 250-1500 meters. Growth habits: Pearl plum loves light, is also shade-tolerant, and is cold-tolerant. It can withstand low temperatures of minus 25°C in winter. It has no strict soil requirements. It grows best in fertile sandy loam and is also tolerant to saline-alkali soil. Pearl plum likes a humid environment. Accumulated water can easily cause plant root rot. Water shortage will affect plant growth. Therefore, timely drainage should be paid attention to in the rainy season. Sufficient water should be poured in the dry season. After watering, the soil should be loosened in time to preserve moisture. In early winter and early spring, water should be drained in time. Pour the freezing water and opening water. Pearl plum is resistant to barrenness. In addition to applying an appropriate amount of organic fertilizer when planting, a nitrogen, phosphorus and potassium compound fertilizer is appropriately applied once every spring, which can make the plant grow vigorously, produce more flowers, and have a long flowering period. Propagation method: The propagation of Pearl Plum is mainly by division method, and it can also be sown. However, due to the small size of the seeds, sowing methods are often not used. Propagation by ramets is usually carried out before germination in spring or after leaf fall in autumn. Dig out the sprouting seedlings that are clustered at the roots of the plants, and plant them separately in clusters of 3 to 5 plants. When planting, apply 2 tons of compost in the hole as base fertilizer, and water thoroughly after planting. From now on, you can water it once a week or so. Until it survives. Clusters that are over 5 years old can grow into very large crowns. The soil around the old clusters can be dug up before they sprout in early spring, and then the surrounding root seedlings can be cut off from the parent plant one by one and dug out, and then moved to the nursery for cultivation. 1 After a year, the seedlings will be ready to go out of the nursery. Sowing method can be used when propagating seedlings in large quantities. The seeds are stored dry and sown the following spring. During the growth process, Pearl Plum has the characteristic of easy germination of root tillers, and can be propagated by division in early spring in March and April. Choose a plant that is healthy, free from pests and diseases, and has many tillers as the mother plant. The method is: dig out the soil around the roots of a mother plant that is more than 5 years old, cut a knife from the middle of the gap, and separate the tillers from the mother plant. Each tiller can be divided into 5 to 7 plants. The separated root tiller seedlings should have complete roots. If the root tiller seedlings have many and thin lateral roots, some should be cut off appropriately when planting. This breeding method has a high survival rate, quick results, and is relatively simple to manage, but the number of breedings is limited. After dividing the plants, water them enough and move the plants to a slightly shaded place. After a week, gradually place them in the sun for normal maintenance. Cutting This method is suitable for mass propagation and can be carried out all year round, but cuttings take root fastest and have a high survival rate in March and October. The cutting soil generally uses 5 parts of garden soil, 4 parts of humus soil, and 1 part of sandy soil. Mix the mixture to make a furrow for open-field cutting. For cuttings, choose current-year or biennial mature branches from strong plants, cut them to 15 to 20 cm long, and leave 4 to 5 buds or leaves. When cutting, insert 2/3 of the cutting into the soil, leaving only the top one or two buds or leaves on the soil surface. The cut of the cuttings should be flat and cut into a horseshoe shape. Cut and insert as you go. Press the soil at the base of the cuttings and water them once. After that, spray water 1 to 2 times a day to keep the soil moist. After 20 days, reduce the number of water sprays to prevent excessive moisture, which may cause branches to rot. Roots can be transplanted in about 1 month. Layering: In March and April, bend the outer branches of the mother plant directly and press them into the soil. You can also circumcise or carve the parts that are pressed into the soil to promote rapid rooting. After the new roots grow, they are separated from the mother plant and can be transplanted during the spring and autumn tree planting seasons. Cultivation technology ① Soil: The soil requirements are not strict, but it will grow better and bloom more luxuriantly when cultivated in deep and fertile sandy loam soil. ② Fertilization: The requirements for fertilization are not high. When first cultivated, sufficient base fertilizer must be applied to meet its growth requirements. Generally, top dressing is not required. In the future, combined with winter management, base fertilizer can be applied every 1 to 2 years. ③ Watering: Water in time during drought in spring. Water thoroughly during drought in summer and autumn to keep the soil from drying out. Antifreeze water needs to be poured once before winter. ④ Light: Pearl plum can tolerate semi-shade, but it can grow well in the sun.

⑤ Pruning: After flowering, the remaining flower branches, diseased branches, and old and weak branches should be promptly pruned to keep the plant shape neat, avoid nutrient consumption, and promote strong growth and luxuriant flowers and leaves. Disease and Pest Control Pearl plum has few diseases. The main pests are thorn moths, red spider mites and scale insects. You can spray 40% omethoate EC 1000 times to kill scale insects, use dicofol 1000 times to control spider mites, and use 50% Marathon EC 1000 times to prevent thorn moths. When leaf spot occurs, round or irregular brown spots will appear on the leaves, and brown mold-like substances will appear sparsely on the underside of the leaves. Prevention and treatment methods: Spray 50% thiophanate 500~800 times diluted solution. When powdery mildew occurs, white or off-white flour-like substances will be produced on the leaves. In severe cases, the tender leaves will curl slightly, the leaves will be uneven, and they will fall off early. The flowers are small and not open, and the flowers are deformed, curled, and dry. Prevention and control methods: ⒈Remove diseased and damaged plants in late autumn to reduce the source of pathogens; ⒉Pay attention to ventilation, reduce air humidity, strengthen lighting, and apply more phosphorus and potassium fertilizers to enhance resistance; ⒊After the onset of disease, the affected parts should be cut off in time, or the diseased plants should be pulled out and burned; ⒋Spray. Spray the same amount of 1% Bordeaux solution during the dormant period, and spray 70% thiophanate methyl 800 times solution or 50% desenonium 800-1000 times solution in the early stage of the disease. Scarabs, such as small blue and white scarabs, bite leaves, buds and flowers, causing leaves to become incomplete. Prevention and control methods: 1. Use the suspended animation of adults to kill them by vibrating branches in the early morning or evening; 2. Spray 40% omethoate 1000 times solution or 50% Marathon 1000 times solution during the emergence period of adults. 3. Take advantage of the adult insect's habit of burrowing into the soil, and spread 2.5% imidophos powder around the plant. After application, loosen the topsoil so that the adult insect will be poisoned and die. Adults and nymphs of the spotted leaf waxhopper often swarm on the undersides of young leaves to suck sap. The infected leaves may suffer symptoms such as perforation, rupture, curling or thickening depending on the leaf age. Prevention and control methods: 1. Overly dense branches and dead branches should be cut off and burned in winter to reduce the source of insects; 2. Insect nets can be used to catch and kill adult insects during the peak period; 3. During the damage period of nymphs and adults, 90% trichlorfon 1000 can be used 1,200 times of liquid, or 1,200 times of 40% dimethoate emulsion for spray killing. Main value: Garden: Pearl plum has beautiful flowers and leaves, has a long flowering period and is in the summer flowering season. It is very common in gardens and is a popular ornamental tree species. It can be planted alone, in rows or in clusters with very good results. Pearl plum is mostly planted as a single plant in gardens and courtyards. Generally, there is no need to fertilize, but it must be irrigated regularly, especially in the dry seasons of spring and summer to keep the soil moist. Fill with sufficient winter water before winter, and protect it for overwintering in high-cold areas. Other management is relatively extensive. Pearl plum has plump bushes and delicate branches and leaves. It is valuable because it produces elegant white flowers in midsummer when flowers are scarce and has a long flowering period. In particular, it has the effect of killing or inhibiting a variety of harmful bacteria, and is suitable for planting in various garden green spaces. In particular, it has the characteristics of being shade-tolerant, so it is a flowering shrub species for greening the shade on the north side of high-rise buildings and various buildings in northern cities. Medicinal Stem Bark: Bitter, cold. Promotes blood circulation, removes blood stasis, reduces swelling and relieves pain. Orun *** Horse urine pruritus, Nala pimples: The skin is mainly used to treat fractures, bruises, joint sprains, redness, swelling and pain, rheumatoid arthritis "Ethnomedicine Chronicles 3". Nala Pimple: It mainly treats fractures and bruises. Daur medicine gaakunku: treats bruises and chondritis. The above-ground part of Ewenki medicine is mainly used to treat redness and swelling. Chao Yao Zhenzhenmei: The skin, leaves and fruit fringes treat rheumatoid arthritis. "Pi Chao Yao". Xudangnamu: Radical cure for arthritis "Ethnomedicine No. 3".