How to plant Patchouli:

1. Selection of seeds. Generally, everyone will choose seeds newly harvested in the first year for sowing in the second year. Such seeds are preserved. Better seeds can also better ensure germination and survival rates, while aged seeds generally have more hidden dangers of insect pests, so they are not recommended.

2. There should be no less awakening of seeds. Before sowing, be sure to take out the Patchouli seeds for awakening and germination treatment. Generally, such seeds are relatively simple to awaken and only need to be soaked in warm water for 24 hours. It can soften the outer shell very well and speed up the germination of seeds.

3. Land treatment: It is better to choose fertile sandy loam for the seedbed. Combined with plowing and applying a certain amount of decomposed manure, then dig a ditch and knock the soil into a fine mound, and arrange it into a ditch with a width of 1.5m. The turtle-shaped seedbed can be moistened with human and animal excrement.

4. Sowing method: Mix the processed Patchouli seeds and plant ash, sprinkle them evenly on the border surface, lightly firm them, and ensure the thickness of the covering soil is about 1cm.

5. Water and fertilizer management. During the growth period, Agastache rugosa needs more water and fertilizer. In addition to applying sufficient base fertilizer before sowing, it needs to be topdressed several times in the seedling stage. However, it should be mainly light fertilizer and the concentration should not be suitable. too high. Fertilizer should also be applied after cultivating and weeding to promote faster plant growth. Water after each application of fertilizer to allow the fertilizer to better dissolve in the soil and make it easier for plants to absorb.

6. Field management: When the Agastache rugosa seedlings grow to a height of about three centimeters, some seedlings that have grown too densely need to be removed, and the seedlings need to be thinned, and the vacant places need to be replanted. After doing this, top-dress appropriately to make it easier to survive. At the same time, weeds must be removed in time to prevent them from affecting the growth of seedlings.

Notes:

1. Disease prevention

1. Brown spot damages leaves. Round or nearly round lesions are formed on the front side of the leaves, with light brown centers, dark brown edges, and light black mold-like growths. It usually starts to occur in May and June, and is heavier during the rainy season. Prevention and control methods: remove diseased leaves promptly and burn them; implement crop rotation; spray 1:1:100 Bordeaux mixture before and at the beginning of the disease.

2． Fusarium wilt Isolated from rotten roots Rhizoctonia solani Kuhn, Fusarium solani (Mart.)App.etWollenw. and F. semitectum Berk. et Rav． and other pathogenic bacteria. It often occurs during the rainy season from mid-June to early July. The leaves and tips of the damaged plants droop, wither, and the roots rot. Low-lying areas prone to water accumulation or shallow ditches with poor drainage are prone to the disease. Prevention and control methods: Drainage ditches promptly after rain to reduce field humidity; in the early stage of the disease, pull out the diseased plants and irrigate the diseased holes and roots of adjacent plants with 1000 times of 70 dicasone powder or 500 times of 40 carbendazim glue suspension to prevent the spread. .

3． Septoria lophanthi Wint: The lesions on both sides of the leaves are polygonal, with a diameter of 1-3 mm at first, dark brown, and the leaf color turns yellow. In severe cases, the lesions merge and the leaves die. Occurs from June to September. Prevention and control methods: Clear the garden in winter, burn the dead branches and leaves together, and spray 50% of the 1000 times solution of Toxoplasma spp., once every 7 days, and spray 2-3 times continuously. No more spraying within 2 weeks before harvest.

2. Pest control

1. Red spider Tetranychus telarius Linne is a common insect pest on patchouli and perilla. It occurs most frequently from June to August when the weather is dry and high temperature and low humidity occur. The adults are small and usually orange-red or yellow. Often gather on the back of leaves to suck sap. Small yellow-white spots initially appear on the injured area, and later larger yellow-brown scorched spots can be seen on the leaf surface. After expansion, the entire leaf turns yellow and loses green, and the leaves fall off. Prevention and control methods: Collect field leaves during harvest and burn them intensively; remove weeds in field ridges, ditch edges and roadside in early spring; spray 2000 times of 40 dimethoate emulsion as early as possible during the occurrence period. Stop spraying within half a month before harvest to ensure that the medicinal materials are free of pesticide residues.

2． The larvae of Plusia agnata Standinger eat the leaves and bite them into holes or notches. In severe cases, the leaves are eaten away, leaving only the veins. The larvae are harmful from May to October. The body length of mature larvae is 3Omm; the head and lower abdomen are thick, the head is yellow-green, the body is green, and there are several thin white vertical lines on the back of the body; the first and second pairs of gastropods are degenerated, and the back of the body is arched when walking. The larvae lurk on the underside of leaves during the day and feed mostly on the leaf surfaces at night and on cloudy days. Control method: Spray with 1000 times of 90 crystal trichlorfon or 250 times of 25 223 emulsion or 300-350 times of 25 insecticide aqueous solution.

3. Tetranychus cinnabarinus (Boisduval) occurs when the weather is dry, high temperature and low humidity from June to August. They gather on the back of leaves to pierce and suck sap. Small spots initially appear on the affected areas, and later larger yellow-brown scorched spots can be seen on the leaf surface. After expansion, the whole leaf turns yellow, loses green, and falls off. Prevention and control methods: Collect field leaves during harvest and burn them intensively; clear weeds in field ridges, ditch edges and roadside in early spring; spray 2000-2500 times of omethoate emulsion 40 during the onset period, but stop spraying half a month before harvest. In addition, there are still damage caused by poisonous moths, yellow-bellied light moths, flea beetles, crickets, cutworms, etc., which can be controlled with 90-crystal trichlorfon or 223 emulsion; cutworms, etc. can be hunted manually.