Did anybody know why some azaleas don't bloom? I live insoutheast

Hi! Try this website that offers 6 reasons why azaleas fail to bloom:https://www.thespruce.com/why-are-my-azaleas-not-blooming-2132266

Then try THIS website for things you can add to make them bloom:

http://homeguides.sfgate.com/can-put-azaleas-make-bloom-69180.html

Good luck!

Azaleas should be trimmed if needed, (never shear them) after the blooms have faded as the buds start forming for the following year in a few weeks. Do this by the first of June. This is the main reason they do not bloom. Azaleas like nitrogen so if you use sawdust or wood chips they will suck up the nitrogen. I usually feed them once a year after blooming. Their roots grow out around three feet so you want to feed them within that circle. If the leaves look smaller than usual, they need feeding and/or are not getting enough water. Water them during dry periods. By the way, rabbits and deer like to munch on them too.

South east where????

As Kathy said above, you have to be careful about only trimming them right after they bloom as they set next year's buds a few weeks after they bloom. If they aren't protected from deer, and the deer eat them, they will not bloom or will put out a poor bloom because of the pruning.