Paulownia mostly deciduous trees, tropical evergreen. A total of seven kinds of the genus, are produced in China, in addition to the north northeast, Inner Mongolia, northern Xinjiang, Tibet and other regions of the country are distributed. Paulownia genus species grow very rapidly, more than ten years of age than their peers Poplar paulownia diameter doubled, but long growth time, there will be a hollow tree trunk. Breed easily, using split-root, tiller, planting and grafting, especially compared with the previous two methods common. Paulownia is a Chinese specialty species, with strong velocity nature, is plain green, important species of farmland shelterbelt construction, all around the tree planting and agroforestry. Paulownia wood texture, straight, beautiful patterns, pleasing color, texture, light, soft, low density, dimensional stability, not Alice does not crack, the production of a single sheet of plywood as the best material, puzzle, timber and so on. Paulownia wood insulation, insulation, insulation performance, resonance is very good, high radiation damping, low internal friction, is an excellent stringed instrument timber, with the name of the musical scale spruce timber comparable. Paulownia timber wood fiber content as high as 50%, but also the production of quality raw particleboard, fiberboard and paper. Paulownia species of the genus are native to China, it has long been introduced to Vietnam, Japan, and Asia. Has now distributed worldwide. Leaves large, 15-40 cm; spring bloom, flowers similar to foxgloves, so English is sometimes called Medicago genus Paulownia Paulownia as originally introduced because of its beautiful blooms United States, but because of its rapid growth, its shade prevent the growth of other plants, trunk susceptible to pests America, in the southeastern United States has been listed as the invasion of harmful species. Traditional culture, Chinese people are generally produced with a relatively hard wood furniture, are not accustomed to the use of paulownia wood. Japanese legend of the Chinese people will also be attached to the Indus will paulownia body that will lead to the Phoenix paulownia. Although the two trees belong to different families, but there are similarities, especially the characters names have a "Tong" word. Conical crown, umbrella or nearly cylindrical, smooth bark childhood with significant Picon, when old diastema; usually false dichotomous branching, branches opposite, often without terminal bud; in addition to all the old branches are outside coat, wool there are various types, such as stellate hairs, dendritic hair, multi-section bristles, clayey glandular hairs, and some types of dendritic densely stellate hairs and hair, the naked eye like fluff, fluff it is commonly known, Certain kinds of nutrition in childhood or branches dense clayey glandular hairs or bristles section. Leaves opposite, and there is a large skillet, vigorous growth of new shoots and sometimes three whorls, long ovate to heart-shaped heart-shaped, heart-shaped base, entire, wavy or 3-5 lobed, serrated often in Youzhu , hirsutism, estipulate. Flowers 3-5 Duo (minimum 1, maximum 8) into cymules, with or without peduncle, but through the winter and leafy involucre bracts shedding most cymules form large inflorescence, inflorescence branches The collateral of varying lengths, so inflorescence into a cone, pyramid-shaped or cylindrical; calyx bell-shaped or inverted base attenuate and conical hair; calyx teeth 5, slightly unequal, a larger rear; corolla big , purple or white, corolla tube base narrowly shrink, usually 5-6 mm from the base of the forward bow camel song or song, song of the sudden swelling above or gradually expanded, funnel-shaped corolla tubular bell-shaped to funnel-shaped abdomen with two Article vertical pleats (only Paulownia no significant vertical pleats), often in the face of dark purple spots, vertical pleats bump in yellow, eaves part two-lipped, upper lip 2-lobed, the number rolled back, lower lip 3-lobed, elongation; stamens 4, two strong, does not extend, near the base of the twisted filaments, Yaocha points; style slightly curved upper end, about as long stamens, ovary two-compartment. Capsule ovoid, ovate-oval, oval or oblong, loculicidal, two-lobed or incomplete 4 crack, peel thin or thick and woody; seeds small, many have membranous wings , with a small amount of endosperm. Paulownia for heat higher, a strong ability to adapt to atmospheric drought, but there are some differences in different species. Soil fertility, soil thickness and degree of osteoporosis have higher requirements. In fear of flooding, poor growth on heavy clay soils. When the water table less than two meters, the growth is poor. Soil pH 6 to 7.5 as well. Paulownia rapid growth of 7 to 8 years old can become useful. In the northern region, with Paulownia growing fastest. Catalpa Leaf paulownia followed Paulownia tomentosa slower growth. Different kinds of growth vary. Such as high growth Paulownia has obvious stages, to the formation of adventitious buds or latent buds strong natural stem leggy branches. After 2-8 years after planting, natural stem upward growth. Throughout the growth process, generally natural stem 3 to 4 times, the individual can be natural stem five times. 1st natural stem height growth of the largest, up to 3 meters, and then gradually decreased. Annual increment peak diameter of 4 to 10 years. Annual increment volume peaked at 7 to 14 years, this time in the morning and evening peak appeared and numerical size, depending on the soil conditions and tending management measures. Paulownia is a happy light of fast-growing species, native to China, the first leaf spring flowering, large flowers are inconspicuous lip, a slight smell when full bloom very spectacular flower garden trees, flowers grow behind large leaves, leaf density and large, very every light shade. Good green and trees species. Paulownia growing very rapidly, more than ten years of age than their peers Poplar paulownia diameter doubled, but long growth time, there will be a hollow tree trunk. Due to rapid growth, so light and soft wood materials, easy to process, but also acid-resistant, moisture-proof insulation. Paulownia tree species of the genus are positive, the most suitable for the growth in well-drained, deep soil, sandy loam with good ventilation or gravel soil, moist fertile soil it hi to pH 6-8 as well, magnesium, calcium, strontium elements have a tendency to selective absorption, and therefore more nitrogen, Adding magnesium, calcium and phosphate. Due to the strong adaptability paulownia, usually in strong acidic or alkaline soil, or in the more barren low mountains, hills or plains also could grow, but avoid stagnant water. Paulownia temperature range of adaptation is also larger in the north -20 ℃ -25 ℃ low temperature capability, and can grow from the northeast Liaoning Province in southern China, north, central, east, south, southwest to the northwest part of the region, the country has to adapt to local 7 types of ecological species, are produced in China, in addition to the north northeast, Inner Mongolia, northern Xinjiang, Tibet and other regions of the country are distributed, cultivated or wild, some regions are introduction. Paulownia in Vietnam, Laos also has distribution, some species have been the introduction and cultivation of many countries on all continents in the world, mainly by its timber. Paulownia long history of cultivation, the genus name for this plant, there are a lot of records in ancient books, such as "Ya," said Wing Paulownia, "Tong spectrum" in white and purple Tong Tong said, "Compendium of Materia Medica," said Tong, paulownia and so on. In two thousand years ago, on the records of Chinese working people paulownia planting experience, in the "Arts for the People", "Tong spectrum" and other books more detailed account of the form of Paulownia, cultivation, processing and utilization of timber property situation aspects. Paulownia breed easily, using split-root, tiller, planting and grafting, especially compared with the previous two methods common. [3] ⑴ select varieties. Commonly referred to as Paulownia, Paulownia actually belong in general. There are nine kinds of the genus, species suitable for growing in the south is Paulownia or Paulownia as a parent hybrids. Fuzhou City, Jiangxi Forestry Research Institute breeding out of six Clones, rapid growth, straight trunk, branches under the trunk, strong adaptability, is suitable for the area south of the Yangtze River to promote the fine lines. ⑵ buried root seedlings. Nursery optional leeward sunny, with sandy loam or loam-based nursery, do high 15 to 20 cm high ridge seedbed, use 1 to 2 years seedling root, root for the good buried, buried root spacing of 1 m × 0.8 m or 1 m × 1 m is appropriate, Shizujifei in June to August growing season topdressing fertilizer to promote its rapid growth. ⑶ afforestation. Afforestation require large hole dug all around, Shizujifei ribbon terraced mountain afforestation require preparation, loose soil layer thickness of 50 to 70 cm, and Shizujifei to achieve the purpose of planting fast-growing year. Lin dominated afforestation density of 5 m × 5 m per 667 square meters (1 acre) planted 26; forest crop planting density of both 5 m × 10 m per 667 m2 planted 13; food for Lord's planting density of 4 m × 30 m per hectare planted six. The species of this genus is a major economic value of fast-growing species, also excellent afforestation species, some species also suitable for agriculture Tong doubles, material Jialiang, versatile, paulownia production development has important value in the national economy. The species of the genus of tall trees, excellent material, light and tough, with strong moisture insulation performance, acid resistant, lead sound good, not Alice does not crack, not insects, easy unglued, texture, appearance, paint Good staining, easy processing, easy carving, widely used in industry and agriculture. In the industrial and defense, can make use of plywood, model airplanes, travel liner, air water transport equipment, but also the production of musical instruments, carved handicrafts, furniture, wire and paper plate and quality; make beams, purlins, building on the door , such as windows and room divider; agriculture production tankers, aqueduct, Taikang, etc., paulownia leaves, flowers can be used for pigs, sheep feed. In the garden, a good kind of greenery and trees. But paulownia too cold, generally located in the Yellow River and Haihe River Basin south, the Yellow River trail so the best sand-fixing species. Medicinal, ancient medicinal also recorded, such as "Compendium of Materia Medica" (1578) description:. "Tong Ye ...... sore eclipse the main evil yin, leather main five hemorrhoids, killing three insects spend Fu pig primary sore, germinal swelling. "Paulownia found on medical leaves, flowers, wood has anti-inflammatory, antitussive, diuretic, blood pressure and other effects.