1. Potted soil Rhododendron is suitable for growing in acidic soil, while the soil in the north is mostly alkaline, so it is necessary to prepare potted soil. Generally, it is mixed with humus and sandy soil, and a certain amount of cake fertilizer can be added as base fertilizer. Be sure to mix well before planting, and change a new pot of new soil every spring.

Second, the water quality acidified azaleas can't be watered with tap water, because tap water itself has chlorine gas and is alkaline at the same time. If you need to stand for a few days before using it, you can add a few drops of white vinegar to the water or acidify it with ferrous sulfate. Acidic water irrigation is more conducive to its growth and can also improve soil quality.

Third, increase humidity Rhododendrons prefer humid environment, while the air in the north is relatively dry. You can spray water on its leaves or on the ground every day, which can increase the humidity of the air. Humidifier can be used for indoor culture and can also humidify effectively.

Fourth, raise the temperature. The wintering temperature of rhododendron should not be lower than 5℃. In winter in the north, azaleas can be placed indoors in places with heating. But don't put azaleas too close to the heating. High temperature baking will also do harm to it, so keep a certain distance. At the same time, it is necessary to ventilate regularly to avoid various diseases caused by poor air circulation.