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Do ashes help grass to grow?

Updated February 21, 2017

Spreading a thin layer of ash onto your lawn helps it grow, according to Oregon State University. Using wood ash as a lawn fertiliser provides potassium and lime, nutrients that all lawns need. Hard woods such as oak are recommended as they produce the most ash per pound of wood and also contain the highest percentage of nutrients.

Too Much Ash Is Harmful

According to University of California at Davis, applying too much wood ash can increase your lawn's alkalinity and salinity and harm grass. UC Davis recommends applying ashes sparingly when grass is dry and watering the lawn immediately after application.

Bottom Line

Oregon State recommends using wood ash in conjunction with a fertiliser that contains nitrogen as wood ash only contains potassium. Avoid using ashes from coal or chemically treated wood on your lawn as these types of ash are not safe for plants.

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About the Author

Megan Martin has more than 10 years of experience writing for trade publications and corporate newsletters as well as literary journals. She holds a Bachelor of Arts from the University of Iowa and a Master of Fine Arts in writing from The School of the Art Institute of Chicago.