What to do if Camellia has buds and doesn't bloom

There are many reasons why Camellia has buds but does not blossom. If it is caused by frostbite, it is necessary to adjust the temperature to above 5 ℃; if it is caused by dry environment, it is necessary to spray water to increase the humidity; if it is caused by insect pests, it is necessary to spray insecticides according to the types of pests.