Earthworms are important for healthy soils. They love to eat organic materials within the soil, so if
you find them, this means you probably have a good amount of available organic materials.
Earthworms also help to maintain healthy soil, since they will migrate to healthy soils where organic
materials are abundant. They will tunnel within the soil, devouring the organic materials, and leaving their castings (worm poo). Earthworm castings can contain as much as 10 times the amount of plant-available nutrients as the original soil.
More: http://www.veggiegardener.com/earthworms-the-unseen-worker-of-garden-soil/
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