Grass clippings are 80% water and return nutrients back to the soil as they decompose so it is best not to collect them and just leave them in your lawn. The only exception is excessive clippings that lay on top should be collected, but if your lawn is being cut often enough this should not be an issue. Recent research has ruled that clippings do not cause thatch and they do not spread lawn diseases. Also, not collecting clippings is a responsible environmental practice as well since landscape waste account for almost 20% of all curbside waste.
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