Worm activity will increase during wetter autumn and winter periods, and decrease in hot weather and freezing conditions as the surface of the ground becomes impenetrable.

Worm casts aren’t just an aesthetic problem, if you have excessive piles of soil, they’re likely to get squashed, covering and suffocating grass and providing areas of nutrient-rich bare soil for weeds to take hold. The casts are soft and squishy and the more you have on your lawn, the more of a muddy mess it can quickly become. Large quantities of soil pass through the worms as they tunnel, mixing with secretions from their digestive systems before being excreted onto the lawn. Worm castings on the lawn are a familiar sight in gardens and you’re most likely to notice them in autumn and winter. Image credit: emilycharlotteann Why you’d want to remove worm castings from your lawnĪs nutrient-dense as worm castings may be, there’s no doubt that the coils of muddy soil left by earthworms are unsightly, especially if you have an earthworm infestation in your lawn.

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