Grass clippings may seem harmless, but when they wash into storm drains, canals, ponds, and other waterways, they can contribute excess nutrients to the water. As grass clippings decompose, they release nitrogen, which can encourage unwanted algae growth and negatively affect water quality. Florida-Friendly Landscaping ™ encourages homeowners to protect water resources by keeping lawn debris where it belongs—on the lawn or properly disposed of.
In the Charlotte Harbor Estuary, too much nitrogen can contribute to algae and cyanobacteria growth. These blooms can become dense and reduce water clarity and block sunlight from reaching seagrass beds. Between 2018 and 2021, Charlotte Harbor and Lemon Bay lost an average of 23% of their seagrass coverage, significant given that seagrasses stabilize the coastline, improve water clarity, remove nutrients, and support up to 90% of all marine species. As algae and cyanobacteria die and decompose, they also consume oxygen in the water, creating stressful conditions for fish and other aquatic life.
To be a good steward, and reduce non- point source pollution, leave grass clippings on the lawn after mowing. Grass clippings are mostly water and contain valuable nutrients that can return to the soil as they break down. This practice, known as grasscycling, can help reduce the need for additional fertilizer while returning organic matter to your landscape. Just remember to mow regularly and avoid cutting more than one-third of the grass blade at a time.
It is also important to keep clippings off sidewalks, driveways, streets, and other hard surfaces. Before or after mowing, use a rake or blower to return clippings to the lawn rather than blowing them into the street or storm drain. Small changes like these support Florida-Friendly Landscaping Principles by reducing stormwater pollution, conserving nutrients, and protecting Florida’s waterways!
Oh, Poop! Is that what I think it is?! – UF/IFAS Extension Charlotte County
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