The soil and water in the north area contain more salt and alkali, and Rhododendron is a kind of acid loving flower. If the soil and water are lack of soluble iron element, Rhododendron will appear yellow leaf phenomenon. So when planting, try to choose acid soil, and pour more alum water or vinegar during growth.
Rhododendron likes to be cool and cool, but if it is placed in the shade for a long time, or the light is too strong, it will cause the branches and leaves of Rhododendron to be too long, the leaves to be thin and yellow, no flowers or even less flowers, so it is necessary to move the flowerpot to the sunny or shady place in time.
The leaves of Rhododendron are relatively fragile. A series of chemicals sprayed to prevent diseases and insect pests may cause the leaves to turn yellow. If the concentration of the agent is too high, and there are residual toxic gases, or the environment suddenly slows down, suddenly cold and hot, it will cause the tip of Rhododendron leaves or local yellow and scorched leaves. Pesticide should be used reasonably to reduce unnecessary air pollution.
The suitable growth temperature of Rhododendron is 15 ~ 25 ℃, and the winter temperature above 10 ℃ can be safe for winter. However, the weather in winter is changeable. If the cuckoo is not moved to the room in time or there is a cold wind blowing directly, it is easy to suffer from freezing damage, resulting in yellow leaves, and even dying when it is serious. Therefore, in the middle of October every year, the cuckoo is moved to the indoor for maintenance and placed in the sunny place, and the room temperature is controlled at about 10 ℃.
In addition to the above-mentioned control of temperature, water, sunlight and soil, we also need to pay attention to several points:
The basin should be turned once every two years in spring or late autumn, and the basin soil should be slightly acid sandy soil with rich humus and loose fertility. When turning the basin, only 1 /3 of them can be replaced, so as to avoid excessive changes in the soil environment, affecting the growth of plants.
The Rhododendron should be pruned once a year after flowering, cutting off the diseased branches and weak branches, and cutting off the long branches, which can not only promote the growth of the plant, but also ensure the perfect plant shape and reasonable distribution of branches. Pruning properly can enhance the transparence of plants and promote the flowering of Rhododendron.
