Updated September 2026 with current identification and quackgrass control guidance.
Quackgrass (Elymus repens), also known as couch grass, is one of the most persistent and frustrating weeds for Edmonton homeowners. Its aggressive underground rhizomes can quickly take over your lawn, crowding out desirable turf and making weed control feel like a never-ending battle.
While Neighbourhood Heroes doesn’t offer targeted chemical treatments for quackgrass within your turf, you can still reclaim and protect your yard with the right DIY strategies. There are proven chemical and non-chemical ways to suppress or remove this stubborn perennial grass.
The trick is knowing what you're fighting first.
SKIP TO QUACKGRASS CONTROL METHODS ↓
Quackgrass can be surprisingly difficult to identify before it develops a seed head because it is itself a grass.
| Feature | What to Look For | Why It Matters |
|---|---|---|
| Leaves | Flat, coarse blue-green blades | Easily blends into regular turf |
| Auricles | Small claw-like structures clasping the stem | One of the strongest identification clues |
| Rhizomes | Pale yellow-white underground runners with pointed tips | Allows patches to spread and regenerate |
| Seed Head | Narrow wheat-like spike | Makes mature plants easier to identify |
| Growth Habit | Shoots appear in spreading patches | New shoots may emerge away from the original plant |
Alberta guidance describes quackgrass as a perennial grass that spreads by both seed and rhizomes, with flat leaves and clasping auricles at the base of the leaf blade.
Pro tip: Pull up a mature shoot carefully and look below the soil. If you find a pale, pointed underground runner connecting multiple shoots, you have one of quackgrass's biggest identifying features.
The grass you see above ground is only part of the plant.
Its underground rhizomes store energy and produce new shoots. Cutting or pulling the leaves may temporarily make the patch disappear, while the underground network remains alive.
That creates three problems:
Government of Saskatchewan guidance makes the same distinction: frequent mowing can suppress quackgrass in lawns, but will not eliminate an established infestation.
That's why quackgrass control is usually about attacking the underground network—not simply making the tall blades disappear.
A thick lawn won't magically eradicate established quackgrass, but healthier turf gives it less room to dominate.
Mow consistently. Regular mowing prevents quackgrass from freely producing tall growth and seed heads.
For Edmonton cool-season lawns, maintaining a healthy mowing height around 2.5–3 inches is a better strategy than repeatedly scalping the lawn in an attempt to starve the quackgrass.
See our guide to ideal mowing heights for Edmonton lawns.
Thin turf creates openings where quackgrass can become visually dominant.
After the active infestation has been controlled, overseeding with competitive cool-season turfgrass can help rebuild lawn density and reduce open growing space.
See our guide on the best time to overseed your lawn in Edmonton.
Competition research has also shown that dense competing vegetation can significantly suppress quackgrass growth. That doesn't mean competition alone will destroy an established rhizome network—but it is an important part of preventing the lawn from becoming thin and vulnerable again.
Don't water by the clock alone.
Deep watering that properly moistens the root zone generally supports healthier turf better than repeated shallow sprinkling.
Our Alberta lawn watering guide explains how to adjust watering to weather and soil conditions.
For small, isolated patches, digging can work.
Loosen the soil around the infestation and carefully remove the underground rhizome network rather than simply pulling the blades.
The key: follow the pale underground runners.
Any viable pieces left behind may produce new growth.
For a large established patch woven through the entire lawn, manually separating every rhizome from desirable grass becomes much less practical.
This is where quackgrass differs from dandelions, clover and many other common Edmonton lawn weeds.
Usually, no.
Most conventional selective lawn weed-control products are designed to kill broadleaf weeds while leaving grasses intact.
Quackgrass is a grass.
Biologically, that makes selective control inside desirable turf much harder because the plant you're trying to remove is closely related to the grass you're trying to keep.
This is why normal broadleaf lawn weed control should not be expected to eliminate an established quackgrass patch.
Government of Saskatchewan's current urban weed-control guidance identifies glyphosate-based non-selective herbicides as an effective chemical option for quackgrass. For severe infestations, it notes that complete lawn renovation may be necessary.
The problem is in the word non-selective.
Glyphosate can also damage or kill desirable turfgrass it contacts.
That means a homeowner dealing with isolated patches may choose to treat only the affected area and later reseed or resod it rather than trying to preserve every existing blade of grass.
Always check the current Canadian product label before application. Health Canada's PMRA database is the authoritative source for whether a particular pesticide product is registered for the intended weed, site and use.
You'll find older articles and agricultural research discussing selective grass herbicides such as sethoxydim, fluazifop and similar products.
That's where the old version of this article needed clarification.
Research showing that an active ingredient affects quackgrass does not automatically mean a Canadian product containing it is registered for use on a residential lawn.
Agricultural products may be registered for crops while being completely inappropriate—or illegal—for the same use in residential turf.
For Edmonton homeowners, the current Canadian product label matters more than an old research paper or American lawn forum.
| Method | Best For | What to Expect | Main Limitation |
|---|---|---|---|
| Frequent mowing | Established lawn patches | Suppresses top growth and seed production | Does not eliminate rhizomes |
| Healthy dense turf | Prevention + long-term suppression | Helps desirable grass compete | Won't eradicate established plants |
| Manual digging | Small isolated patches | Can physically remove rhizomes | Missed fragments can regrow |
| Non-selective spot treatment | Defined patches | Can kill the treated quackgrass | Also damages desirable turf |
| Lawn renovation | Severe widespread infestation | Allows the area to be reset and reseeded | More disruptive and labour-intensive |
| Integrated approach | Recurring infestations | Combines removal, turf repair and prevention | Requires follow-up |
There isn't one magical treatment that works for every infestation.
The size and location of the patch matter.
Pulling a quackgrass blade feels productive.
Unfortunately, you're often removing the easiest part of the plant.
Its rhizomes can remain below ground and push up replacement shoots.
Hand pulling is most useful when a plant is very young or extremely isolated and you can remove the underground material with it.
Once multiple shoots are connected by a mature rhizome network, digging becomes much more reliable than repeatedly snapping the leaves off at the surface.
And avoid aggressive cultivation of an established patch.
Breaking the underground network into numerous pieces can distribute viable rhizome material through the soil.
It can.
Quackgrass is a perennial, and established patches may need repeated attention because hidden rhizomes or untreated shoots can survive.
After treatment:
Monitor regrowth → remove surviving patches → repair damaged turf → rebuild lawn density.
Once the infestation has been knocked back, soil and turf health become much more important.
Balanced liquid fertilization can help desirable turf recover and maintain competitive growth.
Where compaction is limiting turf health, deep-core aeration can also support better rooting and water movement as part of the lawn-recovery process.
The objective isn't to fertilize or aerate the quackgrass away.
It's to make sure healthy turf fills the space after the quackgrass is controlled.
Quackgrass doesn't have to take over your Edmonton lawn—but we also don't want to pretend it's the same problem as a dandelion.
Neighbourhood Heroes does not offer targeted chemical quackgrass treatments within desirable turf.
We can, however, help with the lawn conditions surrounding the problem through:
For quackgrass growing in non-turf areas such as certain beds, cracks or unwanted vegetation zones, different control options may be available depending on the site and current product label.
For established lawn infestations, the long-term goal is straightforward:
Control the quackgrass → repair the damaged area → build thicker turf → watch for regrowth.
Ready to strengthen your Edmonton lawn?
Explore Edmonton Lawn Care Packages
Written by Cole Maimann
Neighbourhood Heroes Property Care — Edmonton's science-backed lawn and property-care team.