culture medium
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.
water
After the pot is put away, 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.
Do plastic surgery
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.
Eliminate pests and diseases
There are few pests. 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.
illuminate
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
Lavender (L. Angus-Tiffany) in England can tolerate the absolute low temperature of -30℃ and the high temperature of 4 1℃, 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, and regular watering is forbidden at home.
Turn over the pot and change the soil.
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.