Tenakill Brook slips through Demarest under a canopy that turns the streets green in June and gold by late October. Blossoming Beginnings LLC tends the lawns along those shaded blocks — mowing, edging, trimming against old stone walls, and hauling out the leaf drop a Northern Valley autumn delivers without mercy. Come winter the same driveways are plowed and the walks cleared and salted, opened early enough that the day can start on time. Turf under big trees takes a lighter touch, and getting that right is a satisfaction of its own. Lawn maintenance and snow clearing for homes in Demarest and the valley boroughs beside it.