My Red Birds in a Tree plant looks like it's drying up suddenly in Longmont CO. This is the end of the second season of full, healthy growth, but almost overnight end of August it's drying up and looks like it's dying. I don't remember this happening last fall. Any suggestions? I read that they don't have a long lifespan, but I expected more that two growing seasons. It gets full sun all day and I water almost every day. Too much water? Not enough? Disease? I love this plant and hate to lose it.