How to Fix Bumps in a Lawn Caused by Worms

Earthworms are vital to lawn health. Their feeding activities aerate the soil, helping to alleviate compaction and allowing more air and soil to reach the roots of the turf. Spring, however, can be a difficult time in the delicate balance between homeowner and worm. This is the time of year when worms are most active in the topmost layer of soil. Often worms come to the surface when the earth below a lawn is saturated with water. When they surface, worms leave castings behind them that harden and create bumps on the lawn.

Rake
Dethatcher
Grass seed

Instructions

- 1
  Rake small piles of worm castings that appear in the spring with a lawn or leaf rake. Take care not to tear the lawn while raking. Spread the worm castings to provide additional nourishment for the lawn.
- 2
  Use a dethatcher to power-rake large areas affected by worm casings. A dethatcher is a powered tool on wheels with a push handle, configured much like a lawnmower, that has a series of rotating blades set along an axle for cutting through thatch. Set the teeth so they will drag through the mounds but not the crown of the lawn grasses. Push the dethatcher in a uniform pattern, as when mowing with a push lawnmower, to spread the castings out evenly.
- 3
  Overseed thin spots in your lawn with grass seed to encourage thicker growth. Establish a lawn-care routine to promote improved turf. More grass will help conceal and cushion bumps when they appear, making them less obvious when you're moving across the lawn.

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