The best time for cutting sweet-scented osmanthus

The choice of cutting time and the control of temperature. Sweet-scented osmanthus cuttings are the best in May and June. The suitable rooting temperature of sweet-scented osmanthus is from 25 ℃ to 28 ℃. If the temperature is too low, it should be covered with plastic film to increase the light and raise the temperature of seedling bed. If the temperature is too high, you should pay attention to shading and lift a corner of the plastic film for ventilation or spray. Cutting substrate and seedbed. Cutting substrate requires loose and permeable, good drainage, high humus content of acid soil or sandy soil, it is best to use vermiculite. A passage should be left around the seedbed and a good drainage ditch should be opened. The soil should be sterilized before insertion. A plastic arch shed with a height of 45 cm is set on the seedbed to moisturize and prevent rain and water. Build a shade shed about 1.6 meters high on the shed. Selection and treatment of cuttings. Cuttings should be taken in the morning and evening or on cloudy days. Cuttings choose semi-lignified branches, cut into 10 cm to 12 cm long, the lower end is cut into horseshoe shape close to the node, and the upper end has 2 to 3 leaves. Cutting skills. The lower end of the cuttings was dipped in ABT rooting powder or soaked in indolebutyric acid from 200ppm to 500ppm for 5 to 10 minutes. Pour water after insertion, then cover with plastic film. Plug-in management. The ① soil moisture requirement is about 50%, while the air humidity requirement is above 85%. At the initial stage of ② cutting, the shade degree of the shade shed is kept at about 80%, which not only prevents strong direct sunlight, but also ensures sufficient scattered light, so as to facilitate the photosynthesis of cuttings with leaves and is conducive to rooting. After 10 days of ③, the leaves were sprayed with 0.2% potassium dihydrogen phosphate or 0.5% calcium superphosphate and 0.1% urea solution. ④ basically took root after 30 days, and the film could be removed and the light could be increased. After taking root, the seedlings should pay attention to foliar spray and shade on sunny days in summer. In order to make the seedlings grow healthily, ⑤ can spray 0.05% "Yemianbao" on the leaves, and do not apply fertilizer from the roots. It can be transplanted to the pot from September to October or the following spring.