I have a row of "Nana" Dwarf Pomegranates that I planted last fall. Lately I noticed that the leaves on several of them have become thin, curly and rather scraggly looking. The overall growth and vitality of the plants seem fine, but the appearance just isn't good. Not all of them are like this either, just a few.

Sorry for not having a picture, but just from the description, any ideas what this might be or what would cause it?