Thatch Management: Dethatch or Aerate?

Moderate Thatch (<1 inch): Core Aerate

Core aeration punches through thatch, pulls soil plugs, relieves compaction, and improves air/water/nutrient exchange. Do it 1–2 times yearly (spring or fall).

Severe Thatch (>1 inch): Dethatch

Vertical mowers (power rakes) slice and remove thick thatch. It's aggressive—expect temporary thinning. Follow with overseeding.

Timing by Grass Type

• Cool-season (bluegrass, rye, fescue): Early fall preferred, spring okay.
• Warm-season (Bermuda, zoysia, St. Augustine): Early summer.

Prevent Thatch Buildup

Mow high, fertilize in spring/fall (not summer), water deeply but infrequently. Cool-season grasses rarely develop thatch under good culture.