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Though the ridges in the soil aren't harmful to your lawn themselves, they are usually an indicator of a problem underground. The raised areas are difficult to mow and they make your lawn uncomfortable to walk and play on.
WHAT CAUSES IT
Moles tunnel through your lawn to feed on grubs and earthworms, creating ridges and mounds.
Fast fix: Press mole ridges flat with the head of a rake to restore the roots' contact with the soil and even the area for mowing.
Prevention: Remove the food source, and the moles will seek it out elsewhere. In the case of grubs (see "Brown grass"), the best long-term control comes from milky disease spores, which come in a liquid form you apply as a drench to the soil.
