Knockout rose tree
Why do leaves turn yellow and then fall off? I have several rose trees. After being planted and healthy for two month or more, on some of them the leaves start turning yellow and eventually fall off. Some of them I pruned and after several weeks when I think they are dead, red leaves start coming on. Also, other trees are very healthy looking and green but do not produce roses. Why?
Here are some links to articles I wrote on these subjects, check them out and let me know if you have further questions or need of help.