There is a particular green the Susquehanna valley turns the morning after a July rain, and Johnson City's lawns wear it well. John's Tree Service & Landscaping Inc. is out in that damp early light, mowing the flats near the river and the yards that climb the hillside streets above town. Grass grows fast on this ground, and the answer is showing up on schedule and leaving an even cut every single visit. Trimming around fences and foundations, edging the walks, opening beds in spring and moving leaves in fall make up the ordinary rounds of a lawn's year. A yard kept that way says something about the house standing behind it.