Why Smart Denver Homeowners Tackle Weeds in Two Steps (And Why Spring Timing Matters)

The Best Weed Control Strategy Isn't One Treatment. It's Two.

We get this question all the time from Denver homeowners: "Why does my lawn keep getting weeds even though I treat them?"

The answer is almost always the same. They're fighting weeds reactively, one battle at a time, instead of running a real program.

A real weed control program has two distinct treatments doing two distinct jobs. Most people only do one of them, which is why the weeds keep coming back.

We're excited to share that we now offer both treatments as part of our service lineup at ACA. We've had this on the request list from clients for years, and we're finally able to deliver it the right way, with the right products, at the right times.

Here's what each one does and why you want both.

Pre-Emergent: Stop Weeds Before They Start

Pre-emergent weed control is the most underrated treatment in lawn care. It doesn't kill weeds. It prevents them from ever existing in the first place.

Here's how it works. When we apply pre-emergent in early spring, the product creates a protective barrier in the top layer of your soil. Weed seeds (especially crabgrass and other annual weeds) try to germinate when soil temperatures warm up. They hit that barrier and never sprout.

The trade-off is that timing is everything. Pre-emergent has to be in the soil before weed seeds wake up. Once you see the first weeds of spring popping up, it's too late for pre-emergent that season. You're in reactive mode.

This is why we monitor Colorado soil temperatures closely and why we book pre-emergent customers early. The window is short, it fills up fast, and missing it costs you the whole growing season.

Pre-emergent is right for you if:

• You want to prevent crabgrass and other annual weeds from germinating
• Your lawn had weed pressure last year and you don't want a repeat
• You're not planning to overseed this spring (pre-emergent blocks all seed germination, including grass seed)

What to know:

• It does NOT kill existing weeds. It only prevents new ones.
• A second application in fall stops the winter seeds from germinating next spring. Worth considering as a follow-up.

Post-Emergent: Eliminate Weeds That Are Already There

Post-emergent is what most people think of when they hear "weed control." It's the treatment that targets and kills the weeds you can already see growing in your lawn. Dandelions, clover, thistle, and other broadleaf weeds.

Here's the part most homeowners miss: post-emergent isn't just about killing what's there. It's about creating conditions where healthy grass crowds weeds out over time.

We use professional-grade products applied at the right point in the growing season. The weeds have to be actively growing for the treatment to work, which means spring through early fall is the right window. Results are typically visible within 7 to 14 days.

A few things to know about post-emergent treatment:

• Avoid mowing for 24 hours before and after treatment so the product can do its work
• Heavy weed pressure may need multiple treatments to fully clean up
• This is most effective when paired with fertilization and proper watering, which strengthens the grass and reduces future weed pressure naturally

Why You Want Both (And How They Work Together)

Think of pre-emergent and post-emergent as two halves of the same plan.

Pre-emergent in early spring prevents the next generation of weeds from ever existing. This stops 80% of the problem before it starts.

Post-emergent through the growing season handles the 20% that slip through, plus any perennial weeds that already had roots in your lawn before the season started.

Run both together and the difference in your lawn is dramatic. Year over year, weed pressure drops dramatically because you're never letting the cycle complete itself. The weeds never get a chance to spread seeds, the grass gets stronger, and the lawn becomes self-defending.

This is the kind of program that turns a lawn around in one or two seasons.

The Spring Timing Problem

If you're reading this in early spring, here's the urgent part.

Colorado soil temperatures are rising fast. The window for pre-emergent application is short and it fills up quickly on our schedule every year. We can only treat so many properties before soil temperatures pass the threshold, and once that happens, pre-emergent doesn't work anymore until next season.

If you want pre-emergent applied this spring, the time to schedule is now, not in a few weeks.

Post-emergent has a much wider window (spring through early fall), but combining it with pre-emergent is the strategy that actually works, so the timing pressure is real if you want the full program.

How to Get Started

If you're already an ACA customer on a maintenance plan, weed control can be added directly to your service. Reach out to your account manager or reply to your service confirmation email.

If you're new to ACA, get a quote and we'll build a custom program that fits your lawn, your budget, and your goals for the season.

The earlier we get started, the more weeds we prevent.

Book My Weed Control Services Today!