By seven on a July morning the air coming off Dug Pond is still cool enough to work in, and that is when the mowers go out. Adan Landscaping & Tree Services Inc keeps Natick lawns on a steady rhythm — cut, edge, trim, then the walk swept clean so nothing is left behind but the smell of grass. There is a real satisfaction in a strip of turf that runs straight to the curb without a wobble anywhere in it. Spring cleanups open a yard back up after the long gray, fresh mulch lies dark against the new green, and come fall the leaves are off the beds before the first hard frost can set them in place. The same route, the same early hour, carries over into Framingham, Wellesley and Sherborn.