There are a number of reasons why lawns get lumps and bumps in them. The continual freezing and thawing over spring can cause soil to shift unevenly. Wild animals or pets can dig up areas of a lawn. Even walking on it when it is too soft either in the spring or after a very heavy rainfall can cause depressions to form in your lawn. If lumps and bumps in your lawn are concerning you it is best to contact a qualified lawn care specialist near you to diagnosis exactly what the issue is and the best way to deal with it.
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