Radermachera sinica not growing? Do these two things well and it will thrive easily, with leaves as glossy as if waxed

I have been growing Radermachera sinica for three years, and the leaves have never grown. What is going on?
Looking at your picture, your leaves are clearly drooping and dark in color, which proves that your light is very sufficient and it is not lacking fertilizer. And there is clearly no rotten leaf situation, which proves that its root system has not rotted either. So by the method of elimination, we know that there are only two reasons causing this situation.
The first is not watering in time. Radermachera sinica likes water very much. If your watering cannot keep up and the potting soil stays dry for a long time, it will not dry out and die, but drooping leaves and no growth will appear. The leaves feel soft when pinched, and they clearly droop. This is obviously caused by the root system being unable to absorb water. If you want it to grow fast, water must not be lacking. When the potting soil below the surface is dry, water it thoroughly in time. Only a sufficient water supply can let it grow well.
Another one is that the humidity is not enough. Radermachera sinica likes relatively high air humidity, especially indoors at home, where the humidity definitely cannot reach that level. On the premise of good ventilation, we can spray water on its leaves to increase air humidity. Only when the air humidity is sufficient can the leaves grow normally, and the leaf color be dark, oily green and glossy, just like waxed. This is also a key to growing Radermachera sinica well. There must be sufficiently high air humidity.
If you want to grow Radermachera sinica well, there must be a sufficient water supply, and also a certain amount of air humidity. If you never water it, it will always be in a half-dead state. Can it grow? Fertilize it regularly, because it is mainly a foliage plant. When we fertilize it, we should choose a multi-element mixed fertilizer mainly based on nitrogen and potassium fertilizer, so that it can continuously grow branches and leaves, and the leaf color will be dark. Give it a proper amount of scattered light. Without light, the branches will become leggy. And the leaf color will also become light. Sufficient water, enough air humidity, regular fertilization, sufficient light. These four points are indispensable. This is what is necessary to grow Radermachera sinica well.
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