Most July afternoons the thunderheads pile up behind the Blue Ridge, and everybody working outside in the Nacoochee Valley keeps one eye on that sky. Aba Landscaping LLC works to that clock — mowing, trimming and bed work paced to get a yard finished before the first fat drops come across the valley. Landscaping in this country means answering to steep ground and heavy soil, so the work is shaped to the lot instead of forced onto it. Grass cut, borders defined, mulch and plantings kept in order, and the whole yard settled back into place. When the rain finally arrives, it falls on something already put right.