Protect Local Streams that Feed our Chesapeake Bay—Follow Maryland’s Lawn Fertilizer Law

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ANNAPOLIS, MD (March 27, 2025) ~ Annapolis, MD - As spring approaches, the Maryland Department of Agriculture is reminding homeowners and lawn care professionals to adhere to Maryland's Lawn Fertilizer Law. This law aims to protect local streams, rivers, and the Chesapeake Bay from nutrient runoff caused by non-agricultural sources such as golf courses, parks, recreation areas, athletic fields, businesses, and urban and suburban lawns.

According to Maryland Agriculture Secretary Kevin Atticks, fertilizer products contain essential nutrients that promote healthy turf. However, over-application or improper use of lawn fertilizer can have harmful effects on the environment. "By following Maryland's Lawn Fertilizer Law, homeowners and lawn care professionals can make a real difference for the Bay," Atticks stated.

For those who hire a lawn care professional to fertilize their lawns, it is important to ensure that they are certified by the department's Turfgrass Nutrient Management Program or work under the supervision of a certified professional from a licensed firm. The department's website provides an updated list of certified lawn care professionals who have been trained in proper application techniques and environmentally-friendly fertilizer practices.

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For those who take care of their own lawns, the department has released a video featuring expert tips on lawn care. Some highlights include skipping spring fertilization if the lawn is already healthy and sharpening lawnmower blades to avoid damaging the grass. It is also recommended to mow the grass at a height of three inches to prevent weed growth and conserve moisture. Leaving grass clippings on the lawn can also act as a natural fertilizer throughout the season.

However, for those who do decide to fertilize their own lawns, there are some important guidelines to follow. It is recommended to test the soil first to determine if additional nutrients or lime are needed. The University of Maryland Extension offers information on soil testing. It is also crucial to read and follow the directions on the fertilizer bag and adhere to the University of Maryland Extension's lawn fertilizer schedule. Additionally, phosphorus should not be applied to lawns unless a soil test shows it is necessary. If any fertilizer lands on sidewalks or driveways, it should be swept back onto the grass or cleaned up. Fertilizer applications should also be kept at least 10 to 15 feet away from waterways and should not be applied if heavy rain is predicted. It is also important to follow the fertilizer blackout dates, which are from November 16 to March 1.

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For more information on Maryland's Lawn Fertilizer Law and best management practices for fertilizing lawns, visit the department's website or the University of Maryland Extension. By following these guidelines, homeowners and lawn care professionals can play a crucial role in protecting the health of local waterways and the Chesapeake Bay.

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