They have no eyes or ears, but they’re an important feature for healthy gardens the world over. This week, we’re digging up the dirt about earthworms. * “Lumbricus terrestris,” or the common earthworm ...

Pittsburgh, Pa., USA: Earthworms, the hardworking invertebrates that grace the upper layers of soil, have long been considered helpful in our home gardens. Earthworms are prolific munchers, grinding ...