Earthworm Castings - Knowledgebase Question

Mckinney, TX
Avatar for Susafa
Question by Susafa
March 19, 2000
We have small mounds in the yard that we thought were somehow ant related. We took a closer look at them and it seems to be made with small mud pellets. I was told that earthworms cause this, do you know what it is?

Answer from NGA
March 19, 2000

Yes those are earthworm castings. There are many species of earthworms that produce different size castings and occur in various numbers. Nightcrawlers produce larger castings and larger piles of castings, but are present in fewer numbers in most cases. Smaller species produce smaller castings and casting piles, but can occur in such large numbers that the entire soil surface is covered. In such cases the soil gets a soft, spongy feel when you walk on it.

There is no need to worry over earthworm activity. They help build the soil and tend to come and go over time. When the weather heats up you should see much less of them.

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