How to propagate oleander

Oleander blossoms from May to October, and the flowering period is as long as half a year, so it is also known as "half a year red".

The main means of propagation of oleander are cutting and sowing.

1) Cuttage propagation

When shaping and pruning, the small lateral branches germinated from the main trunk of oleander should be often cut off so as not to interfere with the shape of the tree and consume nutrients. Using these small lateral branches as propagation materials, it is easiest to survive after cutting. These branchlets are relatively short, although thin and weak, but the tissue is more substantial, with terminal buds at the same time, and form faster after rooting. When cutting the above cuttings, be sure to cut close to the dry skin of the mother plant, and the base of the cut should have a small thick heel, which is easy to produce callus and has the strongest rooting ability, so don't cut it with a knife. Then cut off the dense whorled leaves in the middle and lower part of the branchlets, leaving only one round of leaflets at the growing point, and tie them into a bundle according to 10. First, soak the base in clean water and change the water once every 2 days. If the temperature is right, the wound begins to whiten after half a month, and then forms callus. At this time, take it out of the water, insert it into the plain sand one by one at a distance of 5 to 6 centimeters, insert it to a depth of 2 to 3 centimeters, keep it in the shade, spray water on the cutting bed once a day, and soon grow new roots, and the survival rate can reach 100%.

2) sowing and propagation

The main means of propagation of oleander is cutting, but long-term cutting will also lead to variety degradation, so sowing is also a very important propagation method of oleander. Oleander has less fruit by natural pollination, and it is best to pollinate artificially (especially double varieties). The fruit is a purplish brown, oblong bony fruit, mature and dehiscent around December. The seeds with brown pilose will fall automatically when cracking, and should be collected in time, dried and stored, and the sowing time can be either in spring or summer. The seeds are sown in a shallow basin filled with plain sand and covered with a thin layer of soil (0.2 cm). Then use a fine-hole spray can to spray water once, and then spray it every day to keep the soil moist. Generally speaking, when the temperature is high, it germinates quickly, when the room temperature is about 10 ℃, it germinates in 40 days, and when it is about 25 ℃, seedlings emerge one after another in 20 days. When the seedlings grow to 4 true leaves and are 3 cm high, they can be planted in pots. Sowing koji grows slowly in seedling stage, then accelerates, and can blossom in 16 months. In order to make the seedlings grow quickly, it can be moved to the open field for cultivation, and then put on the pot after the cold weather.

Experiment Wang Ming: Shengqu is stronger than cuttings, tall and straight, large leaves and beautiful plant shape. It has a long life and few diseases. Moreover, sowing is easy to produce variation, which is an important method for breeding new varieties.