Propagation and cultivation techniques of Lavender

Lavender steppe is native to the Mediterranean region, Labiatae lavender genus, perennial subshrubs. Leaf shape varies from variety to variety. Inflorescences are spikelike whorls, with colors ranging from dark purple to pink, but some varieties are white and the whole plant has a fragrant smell. After years of introduction and research, we think that Hokkaido lavender has high ornamental value and is a good variety of modern agricultural tourism. Its reproduction and cultivation techniques are introduced as follows.

1. Morphological characteristics and growth characteristics

Hokkaido lavender is a famous vanilla plant with a height of 20cm to 100cm, alternate leaves, oval-pointed leaves, spikes, blue-purple flowers, fragrant flowers, the title of "quiet perfume plant", flowering from May to October. Lavender is not strict on soil, like sunshine, cold, drought, barren, saline-alkali resistance, not resistant to high temperature and humidity, can grow at 5: 30 ℃, but in midsummer temperature for a long time higher than 38: 40 ℃ stem and leaf withered and yellow, plant growth and flowering will have bad performance, after May need to increase ventilation, in order to reduce the ambient temperature, keep cool.

2. Propagation and breeding

It can be divided into sowing propagation and cutting propagation.

1. Seed propagation: seeds can be sowed and propagated in April. The lowest temperature for seed germination is 8: 12 ℃, and the optimum temperature is 20: 25 ℃. It is planted in May, but lavender seed propagation has great variation and high seed price, so cutting propagation is often used in production. Cutting propagation of lavender has strong adaptability, can be carried out in both spring and autumn, and can be planted even in summer, but it is more laborious to manage.

2. Cuttage propagation: generally choose the terminal buds of healthy plants without diseases and insect pests (about 5cm) or tender branches without Lignification, remove the leaves of the bottom 2 sections when cutting, and then soak them with "Root Sun" rooting agent 100 times. After treatment, the cuttings will take root in the soil for about 2 to 3 weeks. The cutting medium can be evenly mixed with river sand and elliptical bran in the proportion of 2 ∶ 1, and put into a 5 × 10 hole plate for cutting. After cutting, put the seedlings in a cool and ventilated environment, keep the soil moist in the first 3 days, and then depend on the weather to ensure that the branches do not wrinkle leaves, dry up, and improve the survival rate. The management of cutting seedlings is more convenient, there is no need to apply fertilizer in the whole seedling stage, and it is widely used in production.

III. Transplanting management

Lavender seedlings can be transplanted after 1 week when they have roots, and lavender seedlings should be planted with mud as far as possible to ensure the survival rate. Before planting, fully water and thoroughly water the soil, plant the seedlings and spray water again. When planting lavender seedlings, the mud should be flat with the soil, not too deep or too shallow, and the row spacing is 20 × 25 cm. Just three days before planting, it should be watered once every evening, depending on the weather. Fertilize after 5 days, wet the soil before applying fertilizer, apply a little compound fertilizer at 8 cm on the edge of lavender, and water the soil according to the degree of dryness the next day. Ten days later, according to the growth of lavender, hit the top once, let it grow more branches, in its growth of about 20 days, if the branches are less, not dense, apply fertilizer again, hit the top again, otherwise lavender will not need to apply the second fertilizer and top again. However, if the fat and water is enough, it is easy to cause lavender lodging, branches and leaves are too dense, causing stem rot. Lavender usually blossoms about 30 days after topping.

When lavender begins to draw buds, 0.2% potassium dihydrogen phosphate solution is sprayed once a week to promote longer spikes, firm pedicels, bright colors, not easy to lodge, and neat and beautiful flowers until flowering.

Lavender must be pruned after blooming once, cut off the old branches and fertilized. Let the plant regenerate new branches and then bloom.

IV. Pest control

Lavender has fewer diseases and insect pests, and the main insect pests are whitefly. White whitefly is mainly concentrated on the back of leaves, and the leaves fade, curl and yellow leaves are caused by sucking plant juices, which can be controlled by spraying thiazide and acetamiprid. If there are more whiteflies, they can be sprayed once every 5 days. The main diseases are stem rot and downy mildew, which can be sprayed with 600 mn / Zn 800 times solution or 65% Dysen zinc solution with 0.2% wettability.