What Kills Ground Ivy? | Fall Herbicide Timing Wins

Ground ivy (Creeping Charlie) is best killed with selective herbicides containing triclopyr or dicamba applied in early fall, though complete eradication is nearly impossible because surviving root fragments regrow.

A lawn full of Creeping Charlie resists every quick fix. Throw plain 2,4-D at it and you’ll watch the weed smile. The plant thrives in shade, spreads on surface runners, and regrows from any root snippet you miss. The working approach for most lawns is a fall spray window with the right active ingredient, paired with thick grass that chokes it out over time. Here is which chemical to mix, when to apply it, and how to handle the spots that keep coming back.

Why Ground Ivy Is Harder To Kill Than Dandelions

Ground ivy’s waxy leaves repel many spray droplets before the chemical can absorb. The plant also stores energy in an extensive network of stems and roots — any surviving node sends up a new shoot within weeks. This is why a single pass rarely finishes it. The goal isn’t a single knockout; it’s driving the weed back to where the grass crowd it out.

Which Herbicide Active Ingredient Actually Works

Triclopyr is the most effective single ingredient against ground ivy, especially when combined with 2,4-D or fluroxypyr. Dicamba also works but must be mixed with 2,4-D and MCPP — dicamba alone only suppresses the plant.

The Right Application Timing: Fall Is Non-Negotiable

Late September through early November, when daytime highs sit in the 60s–low 70s, is the only window that produces lasting results. Rutgers NJAES researchers confirm the weed is pulling nutrients into its root system during autumn, so the chemical travels deeper and does more damage. An early spring spray burns the leaves but leaves the roots intact. Farmers and agronomists at Iowa State’s Yard and Garden extension note that applying the same product in fall can cut regrowth by three-quarters compared to a spring-only approach.

Mixing Rates That Actually Match Your Sprayer

The correct dosage changes depending on which product you hold. Triclopyr should be mixed at 0.75 fl. oz. per gallon of water — and the label explicitly says do not add surfactant. Adding a wetting agent to triclopyr reduces its effectiveness. For a 2,4-D amine product that contains dicamba, mix 0.72 to 1.1 fl. oz. per 1,000 square feet and add 0.33 fl. oz. of a surfactant like Alligare 90. Gordon’s Trimech (2,4-D + quinclorac + dicamba) mixes at 6.4 oz per gallon per 1,000 square feet. The sheet-sized cheat behind all mixing decisions is our detailed herbicide roundup that covers product-by-product mixing charts.

Common Mistakes That Waste Your Spray

• Using plain 2,4-D: It suppresses but does not kill ground ivy. Must be combined with triclopyr, dicamba, or MCPP.
• Adding surfactant to triclopyr: Many triclopyr labels explicitly prohibit surfactants because they interfere with absorption.
• Spraying before a rain: You need 48 rain-free hours post-application for the chemical to penetrate leaf wax.
• Relying on preemergence herbicides: Penn State Extension confirms they provide zero control of existing ground ivy.

Non-Chemical Options: Borax, Iron, And The Bronze Rake

For readers who prefer to avoid synthetic herbicides, two alternatives produce visible reduction. Chelated iron (brand name Fiesta) burns the leaves black within days. Iowa State’s extension service points out it takes two to four heavy applications across a full growing season, and even then complete eradication is impossible — the goal is to push the weed into the background. Borax (ordinary 20 Mule Team) follows a specific mix: dissolve 10 oz borax in 4 oz warm water, then dilute into 2.5 gallons of water and apply to 1,000 square feet in spring or fall. Higher concentrations damage the soil for grass roots. The bronze-rake trick works in late fall when leaves turn bronze: a hard rake catches the long runners and pulls entire strands from the ground with less breakage than hand pulling in summer.

Ground Ivy In The Garden: No Chemical Shortcut Exists

Broadleaf selective herbicides kill flowers, vegetables, shrubs, and anything broadleaf that isn’t grass. In garden beds, the only options are hand pulling after a soaking rain (use a sod lifter to get deeper root sections) or spot-treating with glyphosate applied directly to leaves with a sponge. Expect to pull and dig over several growing seasons before the patch subsides.

Fall Checklist: The Do-This Cycle That Keeps Creeping Charlie In The Background

1. Measure the area you need to treat — don’t guess square footage, because over-spraying extra chemical wastes money and under-spraying leaves survivors.
2. Buy a product with triclopyr or dicamba as the active ingredient. Weed-B-Gon Purple Label (triclopyr) is the most common retail bottle.
3. Swap your sprayer nozzle to a fan pattern — a cone or jet pattern dumps too much chemical in one spot.
4. Spray only until the leaves are wet and stop before runoff.
5. Wait 21 days, then spot-treat any green survivors with a second application. Max two applications per year.
6. Fertilize with 3 to 4 pounds of nitrogen per 1,000 sq ft annually (split across spring, September, and late October) so the grass outcompetes the weed.
7. Accept that the package says “control” not “eliminate.” A clean lawn with ground ivy is a lawn where the grass is thicker and the weed is harder to see.