Why do the flower buds of potted camellia dry up and turn black?

Insufficient air humidity, poor ventilation, weak light, changing cultivation environment and insufficient topdressing in the early stage will all cause bud drying and bud falling. Top dressing every 10 ~ 15 days from August to June. When the natural temperature drops below 6℃ at night or before first frost, it should be moved indoors at night and back to its original position during the day to adapt to the indoor dry environment. After a period of exercise, it is best to fix it indoors for illumination, and the illumination time should not be less than 8 hours. The pot soil should be dry, and the leaves and buds should be sprayed with water frequently to keep the air humidity, which can reduce or prevent the occurrence of dry buds and falling buds. If the leaves have brown spots, it should be disease-controlled.