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Oregon State University

OSU Extension Service

Photo Credit: Nick Beer - Adobe Stock (Cropped from original)

Latest resources

How do I get rid of crabgrass?

I’m having a problem with crabgrass on my lawn. How do I get rid of it?

Deborah Kirn |Mar 2025 |Featured question

What's your lawn style? High maintenance

Want a lush lawn that’s the envy of your neighborhood? A high-maintenance lawn could be your style. Here are the tips, tools, and materials you will need.

Weston Miller |Sep 2024 |Video

What's Your Lawn Style? Medium Maintenance

If you want a nice lawn but don’t want to commit too many hours to lawn care, a medium maintenance lawn could be just your style. Here’s how we’re going to maximize the look of your medium maintenance lawn.

Weston Miller |Sep 2024 |Video

Pocket Guide to Grass Seed Pests and Beneficials: Identification, Monitoring, Management

ByAmy J. DrevesNavneet KaurJoseph DeFrancescoLeanna Van SlambrookGlenn FisherSilvia I. Rondon andNicole P. Anderson

Learn to identify common pests and beneficial insects found in grass seed production fields across Oregon. This handy pocket guide covers where pests are found, symptoms of pest damage, pest lookalikes and prevention tactics.

Photo Credit: MarFot - Adobe Stock (Cropped from original)

Lawn and turfgrass video library

bright green electric lawn mower on lawn with fallen leaves

Mulch grass clippings and fallen leaves back into the lawn

Credit: Brooke Edmunds

Expert tips on common turfgrass management techniques and pests. Useful for lawns and other managed turfgrass (like athletic fields and parks).

Mowing

Fertilization

Irrigation

Cultivation

Integrated Pest Management (IPM)

Managing Moss in Lawns

Transcript

[MUSIC PLAYING]
The mild, wet winters in Western Oregon
give us lush, green lawns.
But the weather also encourages the invasion of mosses.
To prevent mosses in your lawn, it's
important to understand the factors that
encourage moss growth.
Moss is different from the grassy or broad leaf
weeds found in your lawn.
For example, moss doesn't have a true root
or stem system and moss spreads by spores or plant fragments.
Moss needs lots of moisture to grow.
In Western Oregon, it normally starts growing during the fall
rainy season and reaches a peak in early spring.
You can prevent moss from growing in your lawn
by keeping your turf grass dense and healthy year round.
Here are some things you can do.
First, prune or thin trees to provide your lawn
with plenty of sunlight.
Then install drain tiles or catch
basins to make sure your lawn has good drainage.
It is important to mow and irrigate
your lawn in the summer because this will help prevent moss
from getting established.
And it's also a good idea to test your soil.
If the soil pH is too acidic, you should apply lime.
Finally remember to fertilize your lawn four times a year.
All of these practices will promote healthy turf grass
that is more moss-resistant.
If these practices aren't enough to keep moss
from going in your lawn, you might
want to consider other approaches like de-thatching
or using chemical herbicides.
De-thatchers physically remove the moss from your lawn.
You can de-thatch using a rake or by renting
a de-thatching machine from an equipment supply store.
You can find chemical moss control products
at home and garden stores.
These products include non-selective herbicides,
potassium salts of fatty acids and sulfur-based fertilizers.
Always read the pesticide label and follow the application
and safety instructions.
Keep in mind that products to remove moss from roofs
are not the same as the ones used on lawns.
They cannot be used interchangeably.
If you remove the moss with a de-thatcher or with herbicides,
the lawn will have bare areas.
To avoid re-invasion by moss and other weeds,
it is important to fertilize and inner-seed the lawn.
For sunny lawns, seed with perennial rye grass.
For shady lawns, use a mixture of perennial rye grass and fine
fescue.
To prevent future moss infestations,
be sure to mow weekly, fertilize four times a year
and irrigate frequently in the summer months.
For more information on managing moss in lawns,
refer to the OSU extension publication, Managing Moss
in Lawns in Western Oregon, or visit with your OSU Master
Gardener volunteer.

PNW Turf Insect Pests: Past, Present and Future

Irrigation Rates and Frequencies for Western and Eastern Oregon Turfgrass

ByAlyssa CainAlec KowalewskiBrian McDonald andClint Mattox

When trying to minimize irrigation inputs, the best turfgrass species for the Oregon climate include perennial ryegrass (Lolium perenne) in Western Oregon, Kentucky bluegrass (Poa pratensis) in Central/Eastern Oregon and tall fescue (Schedonorus arundinaceus) in Western, Central or Eastern Oregon.

Photo Credit: bozhdb - Adobe Stock (Cropped from original)

Athletic field management

Best Management Practices for Maintaining Sand-based, Natural Grass Athletic Fields

This publication recommends specific ways to manage sand-based fields, which will require more frequent fertilization, irrigation, and cultivation for proper maintenance than native soil fields.

Alec Kowalewski, Gwen K. Stahnke, Tom Cook, Roy Goss |Apr 2024 |Extension Catalog publicationPeer reviewed (Orange level)

Best Management Practices for Construction of Sand-based Athletic Fields for Football and Soccer

Sand-based, natural turfgrass and synthetic surfaces are the best options for athletic fields in the rainy Pacific Northwest. Compare the benefits and learn the construction component requirements to withstand the range of climatic conditions.

Alec Kowalewski, Gwen K. Stahnke, Tom Cook, Roy Goss |Apr 2024 |Extension Catalog publicationPeer reviewed (Orange level)

Pest management resources

Managing Microdochium Patch in Pacific Northwest Turfgrass

Those round, brown rings that appear on your lawn in spring may just be a passing problem. But if you manage a golf course, you may want to take steps to control Michrodochium nivale, the fungus that ...

Clint Mattox, Brian McDonald, Alec Kowalewski |Jun 2021 |Extension Catalog publicationPeer reviewed (Orange level)

Managing Moss in Lawns in Western Oregon

The mild, wet winters in western Oregon encourage the growth of lawn mosses. This publication describes the factors that contribute to this growth and provides tips for reducing problems. It is a companion to OSU Extension video EM 9176.

Brooke Edmunds, Alec Kowalewski |Nov 2021 |Extension Catalog publicationPeer reviewed (Orange level)

Need help with your lawn?

Typical lawn problems such as moss, disease, weeds and pests are addressed in Solve Pest Problems, a partnership between OSU and Oregon stakeholders to provide safe and user-friendly information for homeowners in the PNW.

Explore more resources

Upcoming Events

Apr 12

Meet Our Experts

Alec Kowalewski
Associate Professor
headshot of Brooke Edmunds
Community Horticulture, Master Gardeners

Contact me about the Master Gardener Program or gardening questions from Marion or Polk counties

Ask Extension

Have a question? Ask Extension!

Ask Extension is a way for you to get answers from the Oregon State University Extension Service. We have experts in family and health, community development, food and agriculture, coastal issues, forestry, programs for young people, and gardening.

How do I get rid of crabgrass?

Q: I’m having a problem with crabgrass on my lawn. How do I get rid of it?

A:View answer |View all featured questions

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