Have about 10 sweet myrtle topiary plants growing on screened lanai in south Florida. Suddenly all plants are dropping lots of leaves . There are no visible signs of pests or disease. Any ideas of what is going on?
Can you provide pictures? If it has been cold recently, then this could be likely. Do you feed these at least once per year? They could also be lacking food, or just rootbound in container. There are very many things that it could be, and a picture will give me a better idea of what is going on.