The borough climbs, and the old resort streets along the ridge still hold their Victorian porches and their oaks, with the lake glinting between them. Gebhard Horticulture and Design tends the lawns on those lots — mowing on a regular turn, edging the walks and drives, trimming the awkward margins where grass meets stone and hemlock shade. Late spring is when it all comes on at once up here, weeks behind the flatlands, and the mowing goes from nothing to everything in a fortnight. Shade, slope and rock each ask for a different cut, and reading them is the difference. The result is a lawn that looks composed rather than merely maintained.