Key points for pot conservation of oleander

Oleander alias willow peach, half a year red, for oleander, oleander is an evergreen large shrub, potted often trimmed into a small Qiaomu, plant height of 2 meters to 3 meters. The stem is erect and smooth, the old branch is grayish brown, the tender branch is green, the branching force is strong, and most of them grow in the form of trichross. Leaves lanceolate, 3-whorled, thickly leathery, short stalked, 10 cm to 25 cm long, apex acute, base cuneate, surface dark green, abaxially light green, midvein obvious, entire, petiole and peduncle purplish red, with a small amount of milk in branches and leaves. Cymes terminal Corolla pink to crimson, Corolla funnel-shaped, 5-lobed, wrinkled on petals, mostly double or semidouble, with light special aroma, oblong fruit, florescence from June to October. Common cultivated varieties are white oleander with white flowers. Variegated oleander having variegated leaves and red flowers. Yellowish oleander with yellowish flowers. In the same genus, there are European oleander, also known as red oleander, produced along the Mediterranean coast, purple-brown branches, large leaves, oval-shaped lanceolate. Large flower shape, dense inflorescence, dense red, double petal, with high ornamental value.

Oleander originated in India, Iran and Afghanistan, has a long history of cultivation in China, throughout the north and south urban and rural areas. Sex likes adequate light, warm and humid climatic conditions. It is also slightly hardy and can survive the winter in the warm temperate zone without falling leaves. Family potted plants in Beijing can wrap the branches together and put them in a leeward and sunny place to survive the winter. Oleander is strong in nature, resistant to barren and drought, and is not strict with the soil, but the pot culture is still better with loose, fertile and permeable common soil, and avoid long-term wet and waterlogging in the basin soil. It has strong resistance to smoke and many kinds of harmful gases.

Oleander is mainly propagated by cutting. In April, combined with shaping and pruning, a section of sturdy branches about 15 cm long was cut for cuttings. Can be tied into dozens of bunches, soaked in a shallow basin of water, the water depth of cuttings up to 1 big 3. The shallow basin is sealed with plastic bags and exposed to high temperature in the sun. After two weeks, the roots were taken out and planted in a small pot or seedling bag with common culture soil. Cuttings survive and sprout, select a strong bud to develop into a new plant, and erase the rest. When the new plant grows to 20 cm high, replace it with a 20 cm tube basin with an inner diameter of 20 cm, and fill the basin soil to the base of the new plant, that is, the original cuttings are buried in the soil to form a rhizome, resulting in a large number of fibrous roots, promoting the growth of the new plant. The following spring set dry shaping and pruning to develop a strong plant with three branches and nine tops.

The base of the old oleander often sprouts into clusters and gives off many twigs. When it grows to 10 cm long, it can be broken off with heel and inserted in fully mature culture soil, shading and moisturizing, and the survival rate is also very high.

Oleander has a strong nature and high and extensive cultivation management. The potted plant turns the pot and changes the soil once every 2 years, and a little feather hoof horn can be put at the bottom of the pot. During the growth period, liquid fertilizer can be applied 1 or 2 times according to the growth trend. Oleander is resistant to pruning and has strong germinating ability. senescent plants can be renewed and pruned in spring combined with turning pots and changing soil to cut off all branches from the base to promote their germination and rejuvenation. In general, the plant should also be moderately pruned in spring to keep the plant well-balanced and strong.

Potted plants in summer should be watered and sprayed frequently to keep the potted soil and the environment moist, but must not be wet for a long time. Oleander also has a characteristic, as long as there is a drought dehydration or water logging, the lower leaves of the plant will soon turn yellow and fall off, so watering should be timely and appropriate. After strong pruning in early spring, you should pay attention to strangling water to prevent root infection and decay. Timely cutting loose pot soil, flowers withered in time to remove, summer occasional aphids and red spiders harm, can be eliminated with general pesticides.