The light of Rhododendron changed before and after flowering. When the flower bud appears, it needs to extend the illumination time properly, but it needs to decrease the illumination properly after it expands. Too much light will do harm to flowers, so it needs to be properly shaded. Long term no light will lead to delayed flowering, so it can not be kept indoors.
Rhododendron also has a high demand for water during flowering. This is because it blooms a lot and the water it needs naturally becomes larger. Lack of water will cause the flowers to wilt a little and the petals will fade. When watering, we should pay attention not to fall on the flowers, which will lead to internal decay and shorten its life.
The temperature of florescence should be kept at about 10-15 ℃ and not less than 5 ℃ at night. Too high temperature will lead to the reduction of flower buds, and low temperature will lead to non flowering. So keeping this temperature can effectively prolong the flowering period
Because the soil is wet for a long time, it is easy to cause various diseases and insect pests. The most common is the flower rot, which will shorten the flowering period and lead to further diseases such as rot. For the diseased flowers, they should be removed in time, and at the same time, they should be sprayed with Diane solution for prevention and treatment. For red spider, army with insect pests, need to spray with Omethoate solution.
