1、 Cause

1. Plants need sufficient nutrition for flowering, and timely nutrition supply can grow buds and open at the flowering stage. If the soil fertility of the cultivated plants is not enough or the elements contained are not enough to support the flowering of the plants, the plants will not open

2. After the plant grows buds, it needs to be exposed to more sunshine. If it is placed in the dark for a long time, the plant is likely to lack light and cannot open on time

3. If the plants are not well protected in winter, or the indoor temperature is too high, the plants cannot open normally

2、 Remedial measures

1. To supplement the plant with flower fertilizer in time, you can go to the florist to buy some fertilizer rich in phosphorus. You can apply it to the plant once in half a month. After a period of time, the plant can bloom

2. Place the plant in a place with good light and let it fully absorb the light. When the light is soft, the plant can be exposed to more sun

3. Move the plant to a place with appropriate temperature. It's best to keep the constant temperature at about 15 degrees to make the flower bud open