September in the Nashoba valley smells like cut grass and windfall apples at the same time, and the low sun makes even an ordinary lawn look like something. Theo's Market Gardens tends Littleton yards in that spirit — mowing and trimming through the season, edging the beds, mulching where the soil needs holding, and clearing the whole property down at the end of autumn. Along the brook the ground stays damp and the grass grows longer than it should; up on the drier ridges it needs coaxing. Reading a yard and giving it what it actually wants is the craft here. The result is a place that looks tended rather than merely maintained.