The main work worms do in your garden is tilling and aerating the soil. They burrow very deep, leaving channels through the soil that break up clods and allow air to enter and water to penetrate and drain away.
In the process of eating at the surface and eliminating lower down, they introduce organic matter to the deeper levels and steadily increase the depth of topsoil. Their main role is to digest decomposing organic matter, converting it quickly into a form plants can use as nutrients.
It is important to maintain good soil structure when gardening organically. Unlike mechanical tillers, earthworms do not damage the soil by inverting it, creating hardpans or breaking up the crumb structure. They never have mechanical breakdowns,…

Source by Julie Villani