I have a large buddleia in a container, and since I bought it and repotted it in April it has bloomed profusely. Last week, while still blooming, some of its branches suddenly had wilted leaves. That spread, and now all but one branch shows wilting. I checked the roots - they did not grow out of the original root ball very much but looked healthy. Any thoughts? I am going to prune back allthe branche stonight and hope it survives.