Beneficial Because:
Earthworm burrows help to aerate soil and improve drainage. Their faeces (worm casts) are a rich source of nutrients for growing plants and help to condition soil.
Food and Habitat:
The common earthworm burrows deep tunnels in the soil. It feeds on decaying vegetation and occasionally dead invertebrates.
Attracting More:
Leave fallen leaves on the surface of flowerbeds. Worms will pull them into the soil for food.