I have a beautiful clematis. It looks like it would be a Lastustern or something similar to it. It blooms yearly and is beautiful both in blooms and leaves. Then, after about a month, it drys up and turns brown, just like it has died. It gets partial sun/shade and is in a well drained area. I don't know what I need to do to keep it pretty all summer, or if they are suppose to dry up after the blooming when it is still summer.