Gloved hands working in a garden bed
Almost every lawn in Beaverton gets some moss. Our wet winters and mild temperatures are perfect for it. But moss is a symptom. It moves in where grass is struggling.
The usual causes
- Shade from big firs and maples, especially on the north side of the house.
- Compacted, poorly drained clay that stays soggy all winter.
- Acidic soil. Many western Oregon soils lean acidic, which grass doesn't love.
- Mowing too short, which weakens grass and lets moss win.
What works
Moss killers (usually iron-based) turn moss black and work fast, but if nothing else changes, it comes right back. The lasting fix is to change the conditions:
- Aerate in fall to break up compacted clay.
- Test your soil, and add lime if it's acidic.
- Raise the mowing height to about 3 inches.
- Thin tree canopies to let more light in, or plant shade-loving groundcovers where grass will never thrive.
Or make peace with it
In deep shade, a soft moss carpet can be a beautiful, zero-mow option. We're happy to help either way.
Want us to take a look?
We'll stop by for free and give you an honest plan, even if it's a job you can do yourself.
More: When to aerate and overseed your lawn in Beaverton · Native plants that thrive in Beaverton yards