1, watering: Lavender doesn't like water staying in the roots. After the first watering, water the soil when it is dry. The surface medium should be dry, the inside should be moist, and the leaves should be slightly wilted. Water in the morning, away from the sun, and don't splash water on leaves and flowers, otherwise it will rot easily 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. After the pot is put away, water it once. The principle of watering after survival is "see dry and see wet". Be careful not to pour water directly on the leaves when watering, and don't let the soil splash on the branches and leaves to avoid diseases.
2. Sunshine: 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. Excessive shading will lead to excessive growth and easy to get sick, but in hot summer, it is best to do some shading treatment to avoid direct sunlight. 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.
3. Temperature: Lavender is semi-heat-resistant, so it is cool. It likes warm in winter and cool in summer. The optimum growth temperature is 15 ~ 25℃, and it can grow at 5 ~ 30℃, and the top stems and leaves turn yellow when it is higher than 38 ~ 40℃ for a long time. 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℃.
4, fertilization: lavender should not be fertilized too much, otherwise the fragrance will fade. When applying fertilizer, you can put bone meal into the pot soil as the base fertilizer (once every three months), and then apply another fertilizer with higher phosphorus fertilizer, such as Huabao No.3 (20-30-20). Apply a small amount of fertilizer
5. Pruning: Pruning must be carried out after flowering, and the plant can be pruned to 2/3 of the original, so that the plant type will be stronger and conducive to growth. After flowering, 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. When the seedlings are too dense, they can be properly thinned and transplanted when the seedling height is about 10CM. It grows very fast and needs to be changed once a year.
6. Disease: When the annual sowing seedlings or cuttings are damaged, the plants wilt, lose water, the leaves are dull, and the top of leaves and branches bend downward, which is most obvious in bud stage. Light can recover at night, and heavy will die in two or three days, with rotten roots and brown shiny stems. In addition to pathological manifestations, seedlings over three years old have wilting symptoms at the center or edge of the plant, which gradually develop inward and outward, and the branches wilt and die, and finally the whole plant dies. The degree of damage varies with the age and variety of trees. Generally, it starts in May and reaches its peak in July and August. The incidence of lavender in France is serious, and the varieties of 2-4 17 in the former Soviet Union are relatively light.
Matters needing attention in lavender cultivation
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.