I don’t know what time of year or how to trim my azalea bush. It is getting very big and I do not want it to get any bigger.
Generally, this is done at the beginning of July, as to not destroy next year's flowers. It will be very important to be sure that the shrub that is planted will not exceed the size of the area, as pruning only prolongs this, rather than prevents it from reaching full size. This article will guide you through the process:
https://www.gardeningknowhow.com/ornamental/shrubs/azalea/pruning-azaleas.htm
Is a fungus attacking my bushes, and if so, what can I do about it? Thanks !
There are a number of possibilities, fungal disease is one. Check the leaves for pests on top and underside of leaves as well. These articles should help pinpoint the problem.
https://www.gardeningknowhow.com/garden-how-to/info/plant-dropping-leaves.htm
https://www.gardeningknowhow.com/plant-problems/disease/leaf-browning-in-center.htm
https://www.gardeningknowhow.com/plant-problems/disease/plant-leaf-spots.htm
I planted this azalea over 10 years ago. After a storm it received some damage and I had to cut it back. Now I have two types of leaves coming from the same plant....is this a sucker plant? Shoud I trim out the back? I'm not sure what to do with it.
It looks like aster yellows so you may want to remove the shrub. Here is more:
https://www.gardeningknowhow.com/plant-problems/disease/aster-yellows-disease.htm