Cultivation management: it is a perennial shrub, and its usable life is about 10 year. It has many varieties and is easy to cultivate. It likes sunshine, heat, drought, extreme cold, barrenness and salinity. The cultivation site needs sufficient sunshine and good ventilation. Time from sowing to flowering (or harvesting): 18 ~ 20 weeks. Lavender should be cultivated in large containers. But in order to prevent it from getting too wet, you can use a pottery jar or a smaller plastic jar, and don't use a big jar unless it is quite large. Lavender can't stand high temperature and humidity, and it will die after being flooded for a long time. When planting outdoors, be careful not to let the rain directly rain on the plants. After May, it is necessary to move the place out of direct sunlight, increase ventilation to reduce the ambient temperature and keep cool, so as to spend the hot summer safely. Pay attention to sunshine, moisture, temperature and patience. 1. Soil: Suitable for weak alkaline or neutral sandy soil. Special attention should be paid to the selection of substrates with good drainage, which can be mixed with 1/3 pearl clay, 1/3 vermiculite and 1/3 sphagnum moss. If it is cultivated in the open field, pay attention to the drainage of the soil, and raise the mound into a border before planting. 2. Watering: Lavender doesn't like to keep water in its roots. After the first watering, water should be supplied when the soil is dry. The surface medium was dry and the inside was moist, and the leaves wilted slightly. Water in the morning, avoid the sun, and don't splash water on leaves and flowers, otherwise it will rot and breed pests and diseases. Continuous humid environment will make the roots grow poorly, there is not enough air to breathe, and even the whole plant will die suddenly. This is often the reason for the failure of lavender cultivation. 3. Illumination: Lavender is an all-day plant, which needs sufficient sunshine and a suitable humid environment. The environment that can give full sunshine is better, and it can grow in half sunshine, but there are few flowers. In summer, at least 50% sunlight should be blocked, ventilation should be increased, and the ambient temperature should be lowered, so that although the growth is weak, it will not die. Lavender can grow well on the flat ground in winter, so it should be cultivated in sunny places. 4. Temperature: Lavender is semi-heat-resistant, so it is cool. It likes warm in winter and cool in summer. The suitable growth temperature is 15 ~ 25℃, and it can grow at 5 ~ 30℃. Limit temperature: above 35℃, above 38 ~ 40℃ for a long time, and the top stems and leaves turn yellow. In northern winter, when the temperature is lower than 0℃ for a long time, the seedlings begin to hibernate, during which the seedlings can tolerate the low temperature of -20 ~-25℃. 5. Fertilization: When fertilizing, bone meal can be put into the pot soil as the base fertilizer (once every three months), and the seedling Shihuabao No.2 (20-20-20) can be applied again after the plant grows, such as Huabao No.3 (20-30-20). Apply light fertilizer. 6. Pruning: Lavender flower essential oil is the most abundant, and it is mainly used in flowers or inflorescences. In order to facilitate harvesting, some small inflorescences in the early stage of cultivation may wish to be leveled with scissors, and the newly grown inflorescences are of the same height, which is conducive to one-time harvesting. Some varieties can be as high as 90 cm, and this method is also used to make plants low, promote more branches and flowers, and increase harvest. Pruning must be carried out after flowering, and the plant can be pruned to 2/3 of its original size, so that the plant type will be stronger and conducive to growth. Pruning should be carried out in cold seasons such as spring and autumn, generally in spring, and pruning in autumn will affect cold tolerance. When pruning, be careful not to cut off the lignified part, lest the plant weaken and die. Key points of preservation: propagation method: at present, cutting is mainly used in production, which can maintain the inherent excellent quality of the female parent. Cutting period: Lavender has strong adaptability to cutting propagation, which can be carried out in spring and autumn. Even in summer, it is feasible to use softwood cutting, but it costs a lot of money. From the production point of view, cutting in spring is generally the best. Selection and treatment of cuttings: the quality of cuttings directly affects the survival rate of cuttings. Cutting should be carried out on well-developed plants, selecting annual semi-lignified branches with short and thick pitch and no heading, and cutting at the top 8 ~ 10 cm. The cut of the cutting should be close to the stem node and smooth as far as possible to avoid breaking the phloem. Cuttings cut in autumn will be cut in winter. Cutting mode: plastic film is used for cutting, and the border can be made according to the width of plastic film during soil preparation. Cover with plastic film after watering and cut immediately. The insertion depth is 5 ~ 8 cm and the row spacing is 20 ~ 25 cm. Management of cutting seedlings: appropriate water content, raising ground temperature and promoting root development; Qin Ying timely pruned the protruding branches, removed spikes, promoted branching and cultivated strong seedlings. Land selection and soil preparation: lavender is drought-resistant and afraid of waterlogging, so it is necessary to choose plots with lower water level. Because lavender is a deep-rooted subshrub, it is more suitable to choose a plot with deep, flat and salt-free soil layer for planting. Select a good plot for soil preparation, level the plot and turn it over deeply. The turning depth is required to be 25 ~ 27 cm. 500 kg of high-quality organic fertilizer (sheep manure), 0/5 kg of phosphate fertilizer/kloc-and 0/0 kg of urea/kloc-were applied per mu, which were used as base fertilizers before deep ploughing. Planting: The best planting time is autumn, and the best planting time is 10. The plant spacing is 60 cm, and the row spacing is 120 cm. Water immediately after planting. 1 1 At the beginning of the month, cover the soil manually to ensure the safe overwintering of seedlings. Lavender likes loose neutral alkaline soil with good drainage. Garden soil can be used as culture soil; Coarse yellow sand; Peat; Organic fertilizer =4:3:2: 1, organic fertilizer must be decomposed. The prepared culture soil must be disinfected first. If possible, it can be fumigated with formalin or disinfected with steam. If the prepared culture soil is less, carbendazim powder can be added, which can also play a role in disinfection. Adjust the pH value to 7 ~ 7.5 with lime. After watering the basin, water it once. The principle of watering after survival is "see dry and see wet". Pay attention when watering: don't pour water directly on the leaves, and don't splash soil on the branches and leaves to avoid diseases. You can also spread a layer of pebbles on the soil surface of the flowerpot, which is beautiful and can prevent diseases. If tap water is used, it is best to use it in the sun for two days. It doesn't need much fertilizer to fertilize lavender. In the spring with rapid growth (March-May), the compound fertilizer of nitrogen, phosphorus and potassium can be applied monthly to make a solution for irrigation, and the concentration is 1%. Too much nitrogen fertilizer can easily lead to excessive growth. After setting the flower, cut it off at the first node under the flower, and trim the plant into a hemisphere by the way. Usually, dry the branches at any time. In order to control plant height or obtain better plant type, it should be cut again in late summer and early autumn to promote the development of new branches. There is little pest control. The disease is mainly root rot, and the incidence rate is the highest in high temperature and stagnant water environment. Control method: irrigate the roots with 800 times of carbendazim and chlorothalonil once a month, especially from June to 10. Pay attention to prevent water accumulation and keep the air dry. Lavender is a long-day plant, and light plays an important role in its development and the formation of aromatic oil. Excessive shading will lead to excessive growth and easy to get sick. In the family, lavender should be placed on the sunny balcony. Temperature Boletus Angus can tolerate the absolute low temperature of -30℃ and the high temperature of 465438 0℃, but the cool environment is the most suitable. French smoked clothes (L.stoechas) like warm environment and can tolerate low temperature of-10℃, so it can be planted in Shanghai. Humidity Lavender likes dry environment, so it is forbidden to water regularly at home. Lavender grows rapidly and needs to be changed once a year. In the first year, the seedlings should be flowerpots with a pot diameter of 12 ~ 16 cm, and in the second year, they should be replaced with flowerpots with a pot diameter of 20 cm.