Lawn Aeration: Why, When, and How to Do It Right

Atlanta soil is heavy clay, easily compacted by rain, foot traffic, and mowing. After a hot summer, it can feel like brick. Digging up the whole lawn isn't practical – but aeration is.

Why Aerate?

Aeration mechanically pokes thousands of holes, allowing water, oxygen, and nutrients to penetrate deeper. This encourages deeper roots, improving drought and disease resistance. The Lawn Institute estimates over two-thirds of U.S. lawns grow on compacted soil. Signs: off-color grass, thinning, heat stress, disease/insect susceptibility.

Best Equipment

• Core aerator (hollow tines/spoons): Pulls up soil plugs. Best choice.
• Solid-tine spike aerators (tractor-pulled): Little benefit. They compact soil around holes and glaze hole walls, impeding air/nutrient movement.

How to Aerate

1. Use criss-cross pattern: first pass entire lawn one direction; second pass at right angles.
2. Check a square foot: should have 10–12 holes. If not, repeat.
3. If surface plugs are objectionable, let dry a few days, then drag a 5'×5' carpet piece to pulverize them.

When to Aerate

Just before rapid growth begins.

• Fescue: September–October (fall growth period)
• Bermuda, zoysia, centipede: April (after green-up, before vigorous growth)

Research Backing

Dr. Robert Carrow (UGA) compared core vs. spike aerators. Core aeration increased deep rooting and water extraction by 25%. Spike aeration showed no effect.

Bonus Benefits

• Soil plugs on surface help decompose thatch without power-dethatcher risk.
• Aeration holes create perfect seed beds for fall fescue overseeding.
• Fertilizer penetrates deeper, aiding recovery.

Common Questions

Q: Do I have to collect the soil plugs?
A: No! Let them disappear naturally or drag carpet/chainlink fence over them after 3–4 days of drying.

Q: Is my neighbor's tractor-pulled spike aerator as good as a rented core aerator?
A: Not at all. Spike aerators compact soil and glaze holes, impeding oxygen. Core aerators remove plugs without compaction. Hollow tines are best.

Q: How often should I aerate?
A: Depends on soil hardness. Test: 5 days after rain, try pushing a Phillips screwdriver into soil. If it only penetrates 1 inch easily, it's time. Many aerate annually with great results.

aerator

aerator cores