How do you deodorize mulch?
James Williams
Updated on April 23, 2026
You can get rid of the sulfuric smell by spreading out your mulch well so it gets aerated. This ensures your mulch undergoes aerobic breakdown. If the smell is due to black rubber mulch/dyed wood mulches, the only way to get rid of the smell is by disposing of the mulch and replacing it with organic mulch.
Why is mulch so smelly?
The Smell of Sour MulchSour or toxic mulch smells horrible, usually with an aroma of vinegar, ammonia, silage or rotten eggs. This is caused by a lack of oxygen in manufacture or storage, leading to the buildup of hydrogen sulfide, methanol or acetic acid during decomposition.
How do you fix sour mulch?
Once mulch has soured, the problem may be corrected by spreading it out in a shallow layer and watering heavily to leach toxic chemicals (Rakow, 1992). Adding large amounts of limestone will neutralize acidity and restore the mulch to useable form.What type of mulch smells bad?
Sour mulch can smell like vinegar, ammonia, sulfur, or silage, whereas good mulch smells like freshly cut wood or earthy like soil. This mulch may also feel very hot to the touch. Sour mulch occurs when the materials used to make mulch are stored in piles that are too large.Is it normal for mulch to smell like manure?
Your mulch smells like manure because there's too much moisture in it, feces is in the mulch, the pile is too hot, or mildew is growing. Always look where you mow before mulching the grass, bark, or other materials. Fungi, dog poop, urine, and many other contaminants can make mulch smell like manure.Good Mulch Smells
How do I fix my soil that smells like ammonia?
Treating common ammonia odors in the home landscape may be done by the addition of carbon or simply applying liberal amounts of water to leach the soil and a lime treatment to increase the soil pH.How long does it take for mulch to stop smelling?
The manure smell of new mulch typically lasts for 3–14 days after the mulch is spread. Spread mulch in a 3-inch (7.5 cm) layer to encourage it to lose its manure smell more quickly. Moist or wet mulch will retain the smell of manure longer. Dry your mulch out on a tarp to get rid of the smell quickly.Can the smell of mulch make you sick?
Can Mulch Smell Make You Sick? Yes! Inhaling methanol, acetic acid, sulfur, or hydrogen sulfide can make you sick. That's because they are toxic chemicals.How do you treat moldy mulch?
Treat Mulch Mold With HeatAllowing the mulch to achieve a temperature between 110 to 140 degrees Fahrenheit can kill nuisance fungi. This is easily accomplished by thoroughly watering the mulch and then raking it into a pile.