Lawn aeration and overseeding in Saco, Maine.

Aeration pays off most on the tighter soils found through the Saco River valley. The NRCS describes the Buxton series, a glaciomarine soil of coastal lowlands and river valleys, as having slow to very slow permeability at depth. Soil like that compacts under foot traffic and sheds water instead of absorbing it; pulling cores lets air, water and roots back in.

On the sandy lots near Ferry Beach, compaction is less of an issue and the goal shifts to thickening turf that thins in dry spells. There overseeding carries more of the weight, and the seed mix leans on fine fescues that tolerate drought. Near the river or the bay, keeping fertilizer to what a soil test supports also keeps it out of water that Saco and its neighbors drink.

Soil testing ties the whole visit together. A test before aeration shows whether the lawn needs lime to reach the pH range UMaine recommends for turf, which matters on the acidic ground common around Saco's pine and oak woods. Seed and any fall feeding then go down with a clear reason behind them rather than by habit.