Up on Taxter Ridge the woods hold their cool late into a June morning, and the lawns below the tree line come in slow, thick and dark green. Genesis Tree Service and Landscaping keeps those shaded yards on schedule — mowing at the height the grass actually wants, trimming clean around trunks and stone, edging the beds back to a line. Shade lawns in Greenburgh are their own puzzle: thin in one patch, lush in the next, wanting overseeding wherever the canopy has won. So a yard gets read before it gets cut. At the end of a pass the grass lies all one direction and the borders look drawn on with a pen.