Answer: Moss usually grows where soil conditions are not suitable for lawn grass. It can be related to being a shady and damp location and/or it can be related to poor soil conditions such as compaction, low fertility and high pH. The first thing to do is run some basic soil tests and see if you need to amend the soil with fertilizer or adjust the pH with lime. You may also need to core aerate the lawn (a machine that pulls up plugs or cores of soil, not the one with spikes on it) and topdress with compost to try to reduce compaction. In the garden, you may need to add generous amounts of organic matter to the soil. Your county extension should be able to help you with testing the soil and interpreting the results based on what you are trying to grow.
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