Moss Weed Killer


Moss growing where it's not wanted becomes a weed. As more moss grows on your roof, on your patio or in your lawn, your house can look unkempt and neglected. You can purchase commercial moss weed killers, make your own from household chemicals or use manual moss weed control methods. For severe moss infestation, you'll need to repeat the control method several time to fully remove moss from the home.


Moss thrives in acidic soil conditions, so you will have to amend the soil pH to prevent the moss from growing back once you've removed it. Moss also grows well in humid and moist environments (like the shady part of a roof), so fighting moss in wet, moist areas like pavers may be a continual problem.

Mechanical Control

Moss has a shallow root system, so you can rake it up with a grass rake or pull out moss that's growing between pavers with your fingers. Once you've uprooted the moss, lay it on a table, patio or other hard surface to dry out and die. When the moss turns brown, it's dead. If you have a pressure washer, you can also pressure wash the mossy area to uproot the moss with little effort.


Moss responds well to herbicide treatment, and the types of herbicides that kill moss actually benefit your grass. Washington State University recommends using herbicide spray that contains ferrous sulfate or ferrous ammonium sulfate. Minerals iron and sulfur boost the green color of your grass.


Use either chlorine bleach or powdered bleach to kill moss that's growing on your roof, patio, pavers, rocks or other hard surface. Combine water and bleach in a 1:10 ratio. Scrub the affected area with a hard-bristled scrub brush to kill the moss.


To increase your soil pH, add lime. Washington State University suggests applying 20 to 30 lbs. of lime per 1,000 square feet if the yard has not received lime in many years. To reduce the amount of moss on shady areas within the yard, prune back tree branches so more sunlight falls in your yard.

Keywords: moss weed control, moss removal lawn, kill moss

About this Author

Based in Northern California, Elton Dunn is a freelance writer and nonprofit consultant with 14 years' experience. Dunn specializes in travel, food, business, gardening, education and the legal fields. His work has appeared in various print and online publications. Dunn holds a Master of Fine Arts in creative writing and a Bachelor of Arts in English.