Earthworms are an essential part of any soil environment. They perform many important functions within this environment such as the breakdown of the thatch layer and the recycling of many nutrients. Their movement through the soil creates tunnels that naturally aerate as they travel. This enables water and air to move more easily through this environment. The roots of grass plants are then able to take in these nutrients more easily creating a lush healthy lawn. Many homeowners complain of having a lawn that is bumpy because of the castings of earthworms. Actually these castings (waste) enriches the soil. By attempting to control earthworms in your lawn you run the risk of having a greater thatch layer build-up. As earthworms go about their daily routine they break apart the thatch and drag organic material into the soil. By incorporating soil into the thatch layer, earthworms encourage greater microbial action that aids in the breakdown of the thatch layer. Generally speaking earthworms can be found in the first foot or so of the soil. The reason for this is simply because this is where food is most readily available. The earthworm takes in soil and organic material that is processed in its gizzard. The material that is expelled is known as castings. The earthworm uses this material to line its tunnel or is deposited at the entrance to this tunnel. The result of this is sometimes a bumpy lawn. Encourage birds that feed on worms to nest near your lawn. This is a good environmentally friendly way of controlling earthworms.
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