Foreign Grasses in Your Lawn: Why They Keep Showing Up (and What You Can Do About It)

You spend time fertilizing, mowing, watering, and caring for your lawn. Then, one day you notice patches of grass that look different. Maybe they're lighter in color, grow faster, or have a different texture than the rest of your turf. What's going on?

The answer is often foreign grasses. And if you live in the Pacific Northwest, they're something every homeowner will encounter sooner or later. Living in the Pacific Northwest means we're surrounded by some of the best turfgrass in the world. In fact, the Willamette Valley is known as the Grass Seed Capital of the World.

What Are Foreign Grasses?

"Foreign grasses" simply refers to grass species that weren't intentionally planted as part of your lawn. They find their way into established turf through natural means and begin growing alongside your desirable grass varieties. These grasses aren't necessarily weeds. They're simply different species that have found an opportunity to establish themselves.

Watch Steve Explain It

In this video, ProGrass Chief Horticulturist Steve Varga explains why foreign grasses are nearly impossible to avoid, what homeowners should realistically expect, and the best ways to manage them over time.

WATCH VIDEO >

Why Are They So Common in the Pacific Northwest?

Unfortunately, there's no practical way to completely prevent foreign grasses from appearing. Grass seeds travel surprisingly well. They can be carried by: wind, birds and other wildlife, pets, shoes and clothing and more. Even a lawn that's been professionally maintained for years can develop new grass varieties over time. It's simply part of having a living landscape.

Can You Stop Them?

The honest answer is not really. Because new seeds are constantly being introduced into your environment, there's no permanent solution that guarantees foreign grasses will never appear again. However, that doesn't mean you're powerless.

How to Slow Them Down

A thick, healthy lawn is your best defense. Proper mowing, fertilization, watering, and routine maintenance help your desirable turf stay dense and vigorous, making it more difficult for unwanted grasses to become established. When your lawn is stressed or thin, foreign grasses have more opportunities to move in.

When Should You Take Action?

For many homeowners, a few patches of different grass aren't worth worrying about. They don't affect the health of the lawn and are mostly a cosmetic issue. But if foreign grasses begin spreading aggressively or create an uneven appearance that bothers you, there are options.

Depending on the species and the extent of the problem, treatments may include:

• Spot removal

• Overseeding

• Renovating portions of the lawn

• In severe cases, a complete lawn renovation

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The best solution depends on your lawn and your expectations.

Need Help Evaluating Your Lawn?

If you're noticing patches of grass that look different and you're not sure whether they're foreign grasses, weeds, or something else, Steve can help. He'll evaluate your lawn, identify what's growing, and recommend the most effective solution based on your goals...not just a one-size-fits-all treatment.

Contact ProGrass, customerservice@prograss.com today to schedule a free lawn evaluation and keep your lawn looking its best throughout the year.