Key points of cultivation and Management of Rhododendron

(1) upper basin and turning basin: yellow mud + rotten leaf soil is the main soil, mixed with a little river sand as culture soil to ensure that the soil is slightly acidic and avoid sticky weight. At the beginning of the basin, try to choose a small basin, gradually change the large basin; cuckoos do not need to turn the basin year after year, when the root system grows all over the basin, watering is not easy to seep out before considering turning the basin to change soil.

(2) Cuttage propagation: the plum rainy season is the most suitable for cutting, when the new branches of rhododendron are semi-woody, and the suitable temperature and humidity are very beneficial to the rooting and survival of cuttings. Take about 5mi 7cm of robust new shoots, remove the lower leaves, retain 4 top leaves, use mountain mud mixed with yellow sand as the substrate, pay attention to shading and frequent spray, and take root about a month later.

(3) grafting propagation: rhododendron is often used as rootstock, and the varieties such as rhododendron which are difficult to take root are grafted and propagated, mostly by means of split grafting or leaning grafting, cutting and so on. For example, the split method is to cut flat the bud head at the top of the rootstock, cut a knife in the middle, cut the bud head of the scion about 1 cm long, cut into a wedge on both sides, insert it into the rootstock, and coat it with plastic film after imperial binding.

July to August

(1) shading: cuckoos like semi-shaded environment and pay attention to shading in summer to prevent sun exposure and excessive temperature. (2) watering: cuckoos like slightly humid environment, watering in the evening is better, high temperature season should also strengthen foliar spraying and increase the surrounding environmental humidity, but should be careful not to make the basin soil too or too wet, so as not to cause defoliation or rotting roots; in addition, we should also pay attention to the commonly used slightly acidic water.

September to October

(1) fertilization: as the temperature drops, topdressing 2Mel can be applied three times, paying special attention to the mature poultry manure based on phosphate fertilizer, in order to promote full buds, large flowers in the coming year, fertilization is usually in the evening, and in the next morning, irrigate once "return water" to accelerate the dissolution of fertilizer in the basin soil and prevent fertilizer damage.

(2) Seedling management: gradually remove the shading net to enhance the light; apply light fertilizer and water to promote seedlings; pay attention to autumn drought and continue to spray water on the leaf surface.

November to February of the following year

(1) preventing cold and overwintering: cleaning plants, spreading rotten compost as base fertilizer, and cultivating soil to protect against cold.

(2) watering: the basin soil can be kept moist, avoid being too wet, otherwise the roots are easy to rot.

(3) flowering regulation: the potted plants are moved into the greenhouse and placed in the sun, sprinkling water at the top every day, keeping warm for 8 ~ 10 degrees, and then increasing the temperature to 15 ~ 20 degrees after the buds show color slightly, then they can blossom during the Spring Festival. If it is refrigerated at 4 degrees before germination in early spring and moved outside in summer and autumn, it can blossom after 2 weeks.

March to April

(1) fertilization: with the rise of temperature, rhododendron is the best time to apply fertilizer before and after flowering. When applying fertilizer, we should grasp the principle of light rather than thick, less rather than more, apply thin fertilizer frequently, often use thin, fully mature bean cake water or manure, try not to use chemical fertilizer, and adjust the amount of fertilizer according to the change of leaf color. If there is too much fertilizer, the leaves droop, and even the tip of the leaf begins to scorch.

(2) Prevention and control of physiological diseases: rhododendron is easy to occur red spider in high temperature and dry season (can be sprayed with dimethoate 1500 times liquid), there are no other serious diseases and insect pests, but it is easy to appear physiological yellowing iron deficiency. The basin soil can be replaced and planted with black mountain mud, or mixed with humus and manure with ferrous sulfate, and some management measures such as controlling watering, improving the air permeability of basin soil, and properly increasing light and ventilation should be taken.