"I have a back yard that has always been very basic and also was neglected for about 15 years previous to our possession. There is green stuff that I cut as if it were a lawn," quips this week's featured poster in the Landscaping Forum. So far, so good. But there seems to be some question about small plum trees shooting up all over the place, creating a nuisance. First question: Are they really plum trees? Second question: What can be done about them? See what our experts have to say.