Midday in June near Halsey Frederick Park, a yard is half deep shade and half hot open ground, and it has to be planned for both. M. ERBS Fine gardens tends Mountain Lakes beds and lawns with that split in mind, mowing at a height that shades its own roots and working close around plantings without scarring a stem. Weeds come out before they get the chance to seed. Borders are edged so the beds read as shapes instead of spills. There is real pleasure in walking off a property at the end of a day and seeing the whole thing hold together, from the road to the last hosta at the treeline.