Up on Orient Heights the yards are small, the wind off the harbor is steady, and the grass grows in fast bright bursts between hot spells. FERNANDO LANDSCAPING LLC keeps those East Boston yards mowed and edged, with the trimmer run along fences and stair rails where a mower cannot reach. Beds are weeded and mulched dark so the green stands off them. In April the work is hauling out whatever winter left behind; in November it is taking the leaves down to bare, breathing soil. A trim strip of lawn in a dense neighborhood is a real thing — it changes how a whole block feels to walk past.