Dujiangyan Houpu body is a treasure, dry, root, skin, flowers, seeds can be used for medicine; wood also has a variety of uses, is a dual-use economic tree species. The skin is thick and oily, the section is purple-brown, less fiber, no impurities, rich in aroma, and unique. Magnolol and honokiol are organic substances extracted from Magnolia, which are fragrant and spicy. They are the main ingredients of Chinese medicine Magnolia. They are traditional Chinese medicines that integrate health care and treatment. The content of Dujiangyan Houpu and its honokiol (C18H1802) is over 8%, far exceeding the 2% regulation of the Chinese Pharmacopoeia, ranking first in the country. Dujiangyan City has the characteristics of good quality, high yield and low heavy metal content. It has a long-standing reputation and quality. Better than other producing areas.

Dujiangyan Houpu quality technical requirements (a) species name. 1. Magnolia officinalis Rehd. Et Wils 2. Magnolia officinalis subsp. biloba Rehd. et Wils. Cheng et Law. This species is a magnolia variety, and the apex of the leaf is inwardly recessed. (2) Site conditions. Within the protected area, the altitude is 800m to 1800m, purple, brownish yellow sandy loam, slightly acidic, soil pH value is 5.5 to 6.8, soil organic matter content is ≥1%. (3) Cultivation techniques. 1. Seed collection and storage: From September to October each year, mature seeds of Magnolia tree are collected for more than 15 years in the protected area for processing and storage. 2. Seed selection: Before sowing, the seeds are round and full, and the 1000-grain weight is not less than 150g. 3. Sowing and seedling: not less than 375Kg per pendulum; seedling height not less than 40cm, ground diameter ≥0.8cm. 4. Cultivation: ≤ 2,500 plants per hectare. 5. Environmental and safety requirements: The use of pesticides, fertilizers, etc. must comply with relevant national regulations and must not pollute the environment. (4) Harvesting and processing. 1. Harvest: Before and after the summer solstice, select trees that have been aged for more than 10 years. Harvesting method: cut a circle from the surface of the tree growing at a distance of 40cm, and then cut it longitudinally, peel off the bark with a knife, use fine stalks and roots, use small rafts to separate the skin, and then strip. Bark. 2. Processing technology: (1) Process flow: grading → micro-cooking → sweating → steaming soft → reel → tie line → cut → dry → packaging → storage. (2) Process requirements: Put the trunk skin in boiling water for 5 to 8 minutes, remove the pile of damp and clean place, cover the straw "sweating", make the inner surface become purple brown or brown, steam soft, roll into a tube Shape, using the well-word stacking method, dry naturally. The root bark and branches are naturally dried. (5) Quality characteristics. 1. Sensory characteristics: smell: fragrant, spicy, slightly bitter. (1) Tube: The dry skin of the main body, which is in the form of a single roll or a double roll. The outer surface is light brown to dark brown with fine vertical stripes. The inner surface is purple-brown, smooth, and marked with oil marks. Hard, not easy to break, the cross section is grainy and oily. Chew less residue. (2) Boots Pak Park: The dry skin near the root, one end is flared like a bell mouth. The outer surface is grayish brown or taupe and rough. The inner surface is purple-brown or deep purple-brown, which is smoother and has a marked oil mark. Hard, not easy to break, the cross section is grainy and oily. There are more disabilities in chewing. (3) Simple: It is a single cylinder or an irregular piece. The outer surface is grayish brown and rough. The inner surface is dark purple brown. Brittle, easily broken, section fibrous. 2. Physical and chemical indicators: water ≤ 13.0%, magnolol, and magnolol content (C18H18O2) boots angle, root ≥ 5%, tube ≥ 3.8%. 3. Safety requirements: Product safety indicators must meet the relevant regulations of the state for similar products.

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Producers within the scope of protection of Dujiangyan Houpu GI products may submit an application to the Quality and Technical Supervision Bureau of Dujiangyan City, Sichuan Province for the use of “Special Marks for Geographical Indication Products”, which shall be approved by the General Administration of Quality Supervision, Inspection and Quarantine.