Culture methods of oleander

Oleander is an evergreen erect shrub of the oleander family, with large, gorgeous flowers and long flowering period. it is often cultivated as an ornamental plant in various provinces and regions of our country, especially in the south. It is often cultivated in parks, scenic spots, roads or by rivers and lakes, and growers to the north of the Yangtze River must spend the winter in greenhouses. Let's take a look at the breeding methods of oleander.

Growth habits of oleander

Oleander likes the warm and humid climate, and its cold tolerance is not strong. It can be planted in the open field in the south of the Yangtze River Basin in China, but sometimes the branches and leaves are frozen and withered in Nanjing, and the seedlings even freeze to death. In the north, it can only be watched in pots, overwintering indoors, and the cold tolerance of white flower varieties is slightly stronger than that of safflower varieties: oleander is not resistant to water and moisture, so it is required to choose places with high dryness and good drainage, like light and fertilizer, and can also adapt to a more shady environment, but less flowers are planted in shade. The ability of sprouting and tillering is strong, and the tree is easy to recover after being damaged.

Culture value of oleander

1. Watch: oleander is a famous ornamental flower with leaves such as willow bamboo, red flowers burning, better than peach blossoms, Corolla pink to crimson or white, with special aroma, flowers grow at the top of branches, gather together like an open umbrella, shaped like a funnel, petals overlap each other, there are three kinds of red, yellow and white.

2. Environmental protection: oleander has the ability to resist smoke, dust, poison, purify the air and protect the environment, and its leaves have strong resistance to harmful gases such as sulfur dioxide, carbon dioxide, hydrogen fluoride and chlorine. Even if the whole body is covered with dust, it can still grow vigorously, which is called "environmental protection guardian".

3. Medicinal: oleander root bark has cardiotonic and insecticidal effects, leaves have cardiotonic diuretic, expectorant and insecticidal effects, and the whole plant has cardiotonic, diuretic, sweating, expectorant, blood stasis, pain, detoxification and rash effects. it is used for asthma, sheep epilepsy, heart failure, killing flies and killing larvae.

Propagation methods of oleander

1. Sowing: oleander can be sowed with picking after ripening, and can only emerge after sowing in the greenhouse for 3 months. Qingming Festival sowed in the open field in autumn can emerge one after another.

2. Striping: oleander striping propagation is carried out in the rainy season, the branches near the surface are cut and pressed into the soil, and after about 2 months, they can be separated from the mother.

3, water insertion: oleander water insertion can be carried out in the growing season, cut 30 cm 40 cm long branches, at the lower end with a knife split 4 cm 6 cm into the water glass container, spring and autumn temperature suitable 2-3 weeks can grow roots, in summer to frequently change water, waterproof deterioration caused by rotting roots.

4. Cutting: oleander cuttings should have the conditions of good quality, strong growth, no diseases and insect pests, and so on. In order to improve the survival rate of cuttings, dozens of cuttings were neatly bundled into bundles, soaked in ABT rooting powder No. 1 100ppm for 2 to 8 hours and rooting powder No. 6 30 to 100ppm for 1 to 8 hours.

Culture methods of oleander

1. Watering: oleander likes water but is afraid of waterlogging. in case of continuous rainy days, stagnant water in the basin should be poured in time to prevent rotting roots. If you water too much, the leaves will fall off one after another, affecting the flowering of the following year. Watering in spring and autumn should be dry and wet, and it is appropriate to keep the basin soil moist. Summer is the period of exuberant growth and flowering of oleander, so it needs a lot of water, so it is appropriate to irrigate the branches and leaves every morning and evening, so as to keep the leaves fresh and green. Enter the house in the middle of October, after entering the room, you should control the watering. Do not have too much water, otherwise it is easy to rot roots and leaves, affecting the growth of the following year.

2. Lighting: oleander likes sunshine, so it should be kept in a sunny place during the growth period, otherwise the flowers are less and the color is light.

3. Temperature: oleander should be planted in leeward and sunny place. In winter, people can prevent freezing indoors, and the room temperature is not lower than O ℃. The temperature is too high and consumes nutrients, which is disadvantageous to the growth and flowering of the second year. In winter, those with high outdoor temperature can cultivate soil to keep out the cold.

4. Fertilization: oleander likes fertilizer, and thin liquid fertilizer can be applied every 20 days or so from going out of the room to flower fade (Frosts Descent). Oleander grows rapidly after the Beginning of Autumn, so fertilizer and water can be applied every 15 days or so until before entering the room.

5. Pruning: oleander is generally trimmed four times, first after Grain Rain in spring, second in July and August, third in October, and fourth in winter. If you want to blossom indoors, move it to the sunshine of about 15 ℃. Prune immediately after flowering, otherwise the flowers are few and small, or even do not bloom. The branches are evenly distributed by pruning, with large flowers and beautiful trees.

6. Disease: Brown spot is an important disease on oleander. At the initial stage of the disease, 1000 times of 50% carbendazim wettable powder or 25% carbendazim wettable powder and 36% methyl thiophanate suspension were sprayed. The prevention and control of black spot should strengthen management, increase tree potential, and spray 75% chlorothalonil 700 times when needed.

Note: the whole plant of oleander is highly toxic and it is dangerous for people and animals to eat it by mistake, so planting near wells and drinking pools should be avoided. The flower fragrance of oleander can make people drowsy and reduce their intelligence. The milky white liquid secreted by stem and leaf bark, flowers and fruits all contain a highly toxic substance called bamboo fungus. If exposed to too much, it is easy to cause cancer of the respiratory tract and digestive system. But a small amount of short-term exposure will not be a big problem.