Every spring, we get the same call: “I’m already seeing crabgrass in my lawn.”
In most cases, the answer is “no”.
In April and May, what most homeowners are seeing is not crabgrass. It is typically a perennial grassy weed like quackgrass, tall fescue, or another coarse grass that stands out early in the season.
Understanding the difference matters, because the way you manage these grasses is very different.
Why It’s Probably Not Crabgrass
Crabgrass is a summer annual weed. That means it follows a very specific lifecycle:
- It germinates when soil temperatures exceed 55 degrees consistently. This usually happens in mid to late spring in Minnesota and Wisconsin.
- It grows slowly at first and is very small into the early summer.
- It does not become noticeable in lawns until late June, July, or August.
- It typically goes to seed in August and September.
- It turns purple after the first frost.
- It is usually gone in October.
So if you are seeing a grassy weed that is already tall, clumpy, or spreading in April or May, it is almost certainly not crabgrass.
Instead, it is likely a perennial grass that survived the winter and is now growing faster than your lawn.
What It Actually Is: Common Lookalikes
The most common grasses we see mistaken for crabgrass in early spring include quackgrass, tall fescue, and other perennial grassy weeds.
These grasses green up quickly, grow faster than the rest of the lawn, and often have a different texture or color.
If you want a deeper dive into identifying and managing these, we’ve covered them in detail here:
Why This Matters for Treatment
Our ability to control crabgrass versus perennial grassy weeds is very different.
- Crabgrass can be controlled at all times during the year using different products and treatment methods.
- Perennial grasses, like quackgrass and tall fescue, do not have selective treatment options that remove them without harming your lawn.
This is why proper identification early in the season is so important.
What Can You Do as a Homeowner to Reduce Crabgrass in Your Lawn?
- Mow higher – Taller mowing heights help your lawn compete and reduce weed pressure
- Seed thin areas – Dense turf is the best long term defense against both crabgrass and perennial weeds
- Water regularly – Regular watering helps maintain a dense lawn, which helps reduce crabgrass invasion
What Can You Do as a Homeowner if You Have Perennial Grasses?
Read our blogs to learn more about control and management options for perennial grasses.
What Can bioLawn Do to Prevent Crabgrass?
We can help in a couple of ways:
- In the spring, we apply a pre-emergent that prevents crabgrass from establishing as it germinates.
- We can seed thin or bare areas to establish desirable lawn grasses that compete with crabgrass.
What Can bioLawn Do to Control Existing Crabgrass?
We can help in a couple of ways:
- We can treat existing crabgrass to prevent it from overtaking your lawn and producing seed.
- We can seed thin or bare areas to establish desirable grasses.
Key Takeaways
If you’re seeing grassy weeds in April or May, it is almost never crabgrass. It is usually a perennial grass that requires a different approach.
The good news is that with proper identification and a clear plan, both crabgrass and these early season grasses can be managed effectively over time.
If you’re unsure what you’re seeing, sending in a photo is one of the best ways for us to help guide the next step.