Oleander management

Oleander, also known as half a year red, willow peach, originated in Iran and India. Because it is evergreen without deciduous leaves, double flower fragrance, red, yellow and white, easy to breed, simple to manage, long florescence and generous crown, it is loved by people. Both the south and the north of our country can be cultivated, potted and planted on the ground. They are often planted in courtyards and flower beds, as well as Jizhi.

However, in the management of oleander, we must do a good job in three points:

It must be trimmed at the right time. The top branch of oleander has the characteristic of one-third, which can be trimmed and shaped according to the need. If you need a trigeminal nine-top shape, you can cut off a part of it at the top of the tripod and you can divide it into nine. If you need nine top eighteen branches, you can leave six branches, cut off from the axils of the top leaves, and eighteen branches can be produced. The pruning time should be after each flowering. In the north, oleander florescence is from April to October. The blooming flowers should be got in time to ensure the concentration of nutrients. It is generally divided into four pruning 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. Through pruning, the branches are evenly distributed, the flowers are colourful and the tree shape is beautiful.

The roots must be soothed in time. The capillary root of oleander grows faster. The three-year-old oleander, planted in a basin with a diameter of 20 centimeters, can grow full of roots before July of that year, forming a ball, hindering the infiltration of water and fertilizer and affecting growth. If the roots are not thinned in time, there will be withering, fallen leaves, death and so on. The best time for root thinning is from early August to late September. At this time, the root is dormant, which is a good opportunity to soothe the root. Sparse the report method: use a fast shovel to cut off the surrounding yellow hair root, and then use a three-pointed hook to sparse along the main root. About half or 1/3 of the yellow hairy roots are removed and replanted in the pot. After thinning the roots, pour water in the shade to keep the basin soil moist. Keep shade for about 14 days, then move to the sun. If oleander is planted in the ground, the yellow hairy root should also be cut around the main pole in mid-September. After cutting the roots, water them and apply thin liquid fertilizer.

It must be fertilized and watered at the right time. Oleander is a flower that likes fertilizer and water, neutral or slightly acidic soil. To apply fertilizer, organic soil fertilizer should be maintained, which accounts for about 20% of the basin soil. If it is used in chicken manure, 15% is enough. Fertilization time: one time before Qingming Festival and one time after the Autumn Equinox. Methods: digging annular trenches at the edge of the basin, applying fertilizer and then covering the soil. After Qingming fertilization, bean cake water retted with water was applied every 10 days or so; after the Autumn Equinox applied fertilizer, bean cake water or peanut cake water, or ten times the amount of chicken manure, was applied every 10 days or so. Without the above fertilizer, you can add five to seven times the water in the urine of people who have been mature for more than seven days, pour it along the edge of the basin, and then pour water thoroughly. Fertilizer with more nitrogen, the principle is dilute, light, less, diligent, strictly prevent burning roots. Proper watering is the key to the management of oleander. Improper watering in winter and summer will cause fallen leaves, flowers, and even death. It is watered once a day in spring and once in the morning and evening in summer, so that the moisture of the basin soil can be kept at about 50%. The leaves should be sprayed with water frequently. If it is too dry, it is easy to lose leaves and wither. Watering can be reduced in winter, but the soil moisture in the basin should be kept at about 40%. The leaves should often be washed with clean water to wash the dust. If it blossoms in winter, it can keep the room temperature above 15 ℃; if it does not blossom in winter, it can drop the room temperature to 7-9 ℃ and put it in the room where there is no sunlight. Oleander planted outdoors in the north needs to be bandaged with herbs to prevent freezing and cold, and remove the cold protection before and after the Qingming Festival. Although oleander is easy to manage, it cannot be paralyzed.