Scientific Name: Glechoma hederacea
Creeping Charlie (Ground Ivy)
Every node a new plant
Creeping Charlie (Ground Ivy) At-a-Glance
Weed Type
Broadleaf
Life Cycle
Stoloniferous perennial
Growth Habit
Prostrate, mat-forming
Root Type
Stolon — roots at every node (shallow rhizomes and fibrous roots also documented)
Spreading Risk
High — by creeping stolons
Pull
With Caution
Identity & Diagnostics
Visual Fingerprint
Ground ivy shows up as a low, dense, dark-green mat that hugs the ground and clearly isn’t grass. The giveaway is the leaf: round to kidney-shaped, about the size of a coin, with scalloped, rounded-tooth edges, held up on its own little stalk. In spring the mat lights up with small funnel-shaped flowers in blue-purple to lavender. In full sun the leaves often turn a reddish-purple; in shade they stay deep green.
Structural Anatomy
Five features together confirm ground ivy — no single one is enough, but all five is a lock.
Square stems. Roll a stem between your fingers and you’ll feel four distinct ridges. Like all mint-family plants, ground ivy has square stems, not round ones. This one test rules out several common look-alikes on the spot.
Opposite leaves in crossed pairs. Leaves come two to a joint, directly across from each other, and each pair is turned at a right angle to the pair above and below it — a stacking pattern that helps it grab light in shade.
Round, scalloped leaves. The leaves are rounded or kidney-shaped, roughly half an inch to an inch and a half across, with blunt, scalloped teeth around the edge. Veins fan out from the point where the leaf meets its stalk, giving the surface a slightly puckered, textured look.
Long leaf stalks. Each leaf sits on a stalk as long as — or longer than — the leaf itself, lifting the leaves up above the creeping stem to compete with the grass for light.
A minty smell. Crush or mow the foliage and it releases a strong, musky-mint, slightly spicy scent. This is the fastest field check there is: no mint smell means it’s not ground ivy.
And the feature that drives everything else about this weed: the stems creep flat along the ground and put down roots at nearly every joint. That’s the “plant Velcro” habit, and it’s why this weed is so hard to remove.
Grass-Specific Anatomy
Sedge-Specific Anatomy
Growth Patterns & Life Stages
Seedlings are rare — the plant almost always spreads by creeping, not by seed — so most people never see one. When they do appear, in cool, damp spring or fall weather, the first true leaves are already the tell: kidney-shaped, scalloped, in opposite pairs.
Runner stage is what you’ll actually encounter. Slender square stems creep outward, reaching anywhere from about two and a half up to seven feet long, rooting down at each joint as they go and knitting into a mat.
Established mat is an interlocking carpet that can blanket large patches of lawn or bed and stays green year-round in mild or shaded spots. This is the “too established to pull” stage.
Flowering runs from roughly March into July, peaking in April and May, with small blue-purple two-lipped funnel flowers clustered in the leaf joints on short upright stalks. Flowering is your cue that the plant is spending energy upward — which, as the timing sections explain, is exactly the wrong moment to spray for a lasting kill.
Gallery
The Identity Trap
Common Lookalikes
Two weeds fool people most often in a real yard: common mallow, whose rounded, scalloped, long-stalked leaves look almost identical to ground ivy’s, and henbit, a mint-family cousin that shares the square stem and the minty smell.
Identification Differentiators: How to Tell Them Apart
Ground ivy vs. common mallow. The leaves look like twins, so use the stem and the smell. Ground ivy’s stem is square and its crushed leaves smell minty; mallow’s stem is round and its leaves have no scent. Mallow also grows from a single deep taproot and does not root along its stems, while ground ivy roots at every joint.
Ground ivy vs. henbit. Here the mint smell won’t save you — henbit is also square-stemmed and minty. Use habit instead. Ground ivy creeps flat and roots at its nodes; henbit stands upright and roots only at its base. Henbit’s upper leaves clasp the stem directly with no stalk, while every ground ivy leaf has a long stalk. And henbit is a winter annual that dies off on its own by early summer, whereas ground ivy is a perennial that never leaves.
Growing Conditions
Host Grasses
Ground ivy invades cool-season lawns most heavily — Kentucky bluegrass, perennial ryegrass, and fescues — and Kentucky bluegrass is especially vulnerable because it thins badly in shade and leaves gaps the weed walks right into. It’s far less of a problem in warm-season lawns: in full sun, vigorous grasses like bermudagrass and zoysiagrass generally outcompete it, and it’s largely restricted to shaded, wet corners where those grasses thin out. It doesn’t respect any particular grass so much as it exploits thin grass — whatever the species, a weak or shaded stand is the opening.
Host Environment/Area
This is a shade-and-moisture weed. It gets its first foothold in damp, shaded, poorly drained spots — under tree canopies, along the north sides of buildings, in low areas that hold water — then sends runners out from there into sunnier open lawn. It’s just as at home in landscape beds, where rich, moist, mulched, sheltered soil matches its native woodland-floor habitat almost perfectly. In beds, freed from mowing, it can even mound up a foot or more instead of staying flat. Very often it establishes first in a bed or tree ring and uses that as a launch pad into the lawn.
Soil Indicators: What the Presence of This Weed Reveals About Your Yard
Ground ivy is a reliable read on the ground it’s growing in. A thriving patch usually signals some mix of shade, wet or poorly drained soil, and compaction — often a low spot, heavy clay, or an overwatered zone. It also tends to flag turf that’s short on nitrogen: the soil may be rich in organic matter, but if little of that nitrogen is available to the grass, the grass thins and the weed moves in. It leans toward neutral-to-alkaline soil and dislikes strongly acidic ground. Treat a ground ivy takeover as a message: the site is too shady, too wet, or too compacted for grass to win there, and fixing that is part of the fix.
Lifecycle and Season
Lifecycle Category and Management Implications
Ground ivy is a stoloniferous perennial — it does not die at the end of the season. Its crowns, rooted nodes, and shallow underground stems live through winter and push new growth every spring, which means two things for control. First, pre-emergent herbicides — which only stop sprouting seeds — are close to useless against an established patch, because this weed spreads by rooting stems, not seed. Second, the only tools that actually work are systemic post-emergent herbicides timed to when the plant is moving food down into its roots, plus mechanical removal careful enough to leave nothing behind. It’s a multi-season job, not a weekend one.
Germination Trigger
For an established patch, seed germination isn’t the issue — regrowth from crowns and rooted nodes is. That growth reawakens as soil warms in early spring: vegetative shoots begin around 40°F, and rapid lateral spread kicks in once soil settles at 55°F and above. Seedlings, when they occur at all, come up in the cool, moist conditions of spring or fall.
This is where ground ivy is worst. It grows nearly all season, with surges in spring and fall, and stays green through much of winter — with partial topgrowth dieback after a hard frost in the colder states, though the crown always survives. There’s no pre-emergent window worth targeting against an established stand. The window that matters is fall, from late September through November, after the first frost — that’s the high-value time to spray, for the reason explained under Post-Emergent in Lawn. Spring, during the April–May bloom, is a distant second choice.
Ground ivy is a minor, localized problem in the warm-season zone — its range runs south only to the Piedmont, and it’s largely absent from the hot, acidic, sandy soils of the lower coastal plains. Where it does appear, it’s confined to shaded, wet pockets where warm-season grass has thinned. It’s active in the cooler months and goes semi-dormant in summer heat, exactly when bermudagrass and its relatives are strongest. Its spring surge collides with green-up, when it can crowd and shade slowly-waking C4 turf. Target it in fall (late September into October), or in early spring before green-up. Do not spray systemic broadleaf herbicides on warm-season turf that’s in the middle of greening up — that’s how you get chlorosis and stalled growth (see Post-Emergent in Lawn for the C4 chemistry, which differs sharply from the cool-season chemistry).
The transition zone is the most complicated of the three, because the fall spray window collides head-on with the fall seeding window. Ground ivy grows all season here, surging in spring and fall and often staying evergreen through winter. The best time to spray is mid-to-late fall, right after the first frost. But that’s the same stretch when cool-season lawns are overseeded and renovated — and most broadleaf herbicides require a 3-to-4-week gap between spraying and seeding. So you have to choose: spray first and push seeding later (risking grass that’s too young to face winter), or seed first and wait about four weeks (until the new grass has been mowed twice) before spraying — which shoves the spray into cold weather that weakens it. In spring, the mirror problem appears: a broadleaf spray can injure bermudagrass or zoysiagrass that’s greening up, and some products (like quinclorac blends) are only safe on zoysiagrass while it’s fully dormant.
Technical Specifications
Stem Shape: Square
Leaf Morphology:
Heart-Shaped
Round/Oval
Leaf Margin: Serrated
Flower Color:
Purple
Growth Habit:
Creeping/Vining
Root Type: Stoloniferous
Bloom Time:
April
May
June
Spread Mechanism:
Seeds
Rhizomes
Fragmentation
Spreading Risk:
Invasive
Pre-emergent Window: Fall
Toxicity Status: Toxic to Pets/Livestock
Common Habitats:
Maintained Turf
Garden & Open Soil
Woodland & Shade
Disposal Protocol: Landfill Only
Effective Active Ingredients:
2,4-D
Dicamba
Triclopyr
Fluroxypyr
Frequently Asked Questions
These answers are synthesized from botanical morphology studies and herbicide efficacy trials conducted by leading university agricultural extensions.
Because you almost certainly left nodes behind. Ground ivy roots at every joint, and a single joint with a bud and a bit of root rebuilds the whole plant. Unless you removed every fragment — or it crept back in from an untreated bed or the neighbor’s yard — a few weeks later you’re looking at a fresh patch.
No. Ground ivy grows flat, below the mower blade, so mowing barely touches it — and if it chops the runners into pieces and flings them across the lawn, mowing can actually help it spread. Mowing high still matters, but as a way to thicken the grass and shade the weed out, not as removal.
Usually one of two things: the wrong product or the wrong season. A weed-and-feed or a 2,4-D-only spray browns ground ivy but doesn’t kill it. Use a triclopyr- or fluroxypyr-based product (or the right warm-season chemistry), and spray in fall after the first frost, when the plant carries the herbicide down into its roots. Spring sprays tend to disappoint.
Not immediately. Most broadleaf herbicides need a 3-to-4-week gap before you seed. In fall that gap collides with prime overseeding time, so you have to pick an order: spray first and seed later, or seed first and wait about four weeks (until the new grass has been mowed twice) before spraying.
Start with the bed and the edge, not just the lawn. Ground ivy often sets up in a bed or tree ring first and launches runners into the lawn from there, so if you only treat the lawn it just re-invades. Clean up the bed, cut a hard edge between bed and grass, and treat both sides.
Scientific Authority
This profile is constructed using forensic botanical data and Integrated Pest Management (IPM) research. We prioritize scientifically-vetted identification and control methods that protect the broader ecosystem while ensuring successful eradication based on peer-reviewed agricultural studies.
Primary Resources
- Penn State Extension — Lawn and Turfgrass Weeds: Ground Ivy (Glechoma hederacea L.): https://extension.psu.edu/lawn-and-turfgrass-weeds-ground-ivy-glechoma-hederacea-l
- Penn State Extension (Master Gardener, Chester County) — What to Do About Ground Ivy: https://extension.psu.edu/programs/master-gardener/counties/chester/how-to-gardening-brochures/what-to-do-about-ground-ivy
- University of Minnesota Extension — Ground Ivy (Creeping Charlie): https://extension.umn.edu/weeds/ground-ivy
- NC State Extension (TurfFiles) — Ground Ivy: https://www.turffiles.ncsu.edu/weeds-in-turf/ground-ivy/
- NC State Extension (Plant Toolbox) — Glechoma hederacea: https://plants.ces.ncsu.edu
- NC State Extension Publications — Ground Ivy: https://content.ces.ncsu.edu
- Texas A&M AgriLife Extension (AggieTurf) — Ground Ivy: https://aggieturf.tamu.edu/turfgrass-weeds/ground-ivy/
- University of Georgia CAES (GeorgiaTurf) — Ground Ivy: https://turf.caes.uga.edu/pest-management/weeds/broadleaf-weeds/ground-ivy.html
- Clemson Cooperative Extension (HGIC) — Weeds as Indicators: https://hgic.clemson.edu/hot-topic/weeds-as-indicators/
- LSU AgCenter — Homeowner ground ivy / Roundup reformulation: https://www.lsuagcenter.com
- West Virginia University Extension — Ground Ivy: https://extension.wvu.edu/lawn-gardening-pests/weeds/ground-ivy
- University of Tennessee Extension — Ground Ivy (Glechoma hederacea), Publication W266: https://utia.tennessee.edu
- University of Missouri Extension (Mizzou WeedID) — Ground Ivy: https://weedid.missouri.edu/weedinfo.cfm?weed_id=124
Additional institutions cited in the research text: Purdue University Extension; Ohio State University Extension; Rutgers Cooperative Extension; University of Wisconsin Extension; University of Illinois Extension; University of Maryland Extension; Michigan State University Extension; UMass Amherst Turfgrass Program; Cornell Cooperative Extension; Iowa State University Extension; University of Florida IFAS Extension; Auburn University Extension; University of Arkansas Cooperative Extension; Virginia Tech Extension; Kansas State Research and Extension; University of Kentucky Extension; UC IPM; The Morton Arboretum; Weed Science Society of America.