Question: are firewood ashes good for grass?
Answer: 4 - Lawn Fertilizer - Wood ash contains 10-25% calcium, 1-4% magnesium, 5-15% potassium and 1-3% phosphorus. ... It's alkaline nature makes ice melt, and then if the sun is out, the darkness of the ash creates heat, melting ice more and faster than regular ice melt - I tested it in my driveway in 2011. 9 - Algae Deterrent.