The fastest way to get rid of dollar weed in garden is to dry soggy soil, pull roots, and spot-treat stubborn patches with lawn-safe herbicides.
If you are tired of round, coin-sized leaves popping up between tomatoes, roses, or lawn edges, you are not alone. Dollar weed (often called pennywort) shows up in beds and turf where the ground stays wet and thin. Learn how to get rid of dollar weed in garden without wrecking your soil, harming nearby plants, or creating a cycle where it returns every season.
This guide walks through practical steps that gardeners use at home: fixing moisture problems, hand removing plants, mulching correctly, and, when needed, using herbicides that target dollar weed while sparing grass and ornamentals. By the end, you will have a clear plan instead of random spraying or endless pulling.
What Dollar Weed Is And Why It Appears
Dollar weed belongs to the Hydrocotyle group, a group of low-growing perennials that spread through creeping stems both above and below the soil. It has one round, glossy leaf on each stalk, about the size of a small coin, with the stalk attached near the center of the leaf. This look separates it from plants like dichondra, which has a notch and the stalk on the edge of the leaf.
This plant loves damp, compact spots. University extension services note that dollar weed usually shows up where irrigation runs too long, drainage is poor, or low areas trap water in heavy soil. A thin lawn or bare soil in garden beds gives it room to spread fast through runners and underground segments that root at each node.
Quick Dollar Weed Identification And Clues
| Clue | What You See | What It Means |
|---|---|---|
| Leaf Shape | Round, like a small coin | You are likely seeing dollar weed, not clover or dichondra |
| Leaf Surface | Shiny, bright green, slightly waxy | Water beads on top, which helps the plant shrug off sprays |
| Leaf Attachment | Stalk joins near the center of the leaf | Classic Hydrocotyle pattern that helps with identification |
| Growth Habit | Low mat, spreading patches, often tangled | Stolons and rhizomes are extending through the bed or lawn |
| Moisture Level | Soil feels damp long after rain or watering | Too much water is helping dollar weed outcompete turf and ornamentals |
| Location | Near downspouts, irrigation heads, or low spots | Drainage or watering patterns need correction |
| Companion Weeds | Presence of sedges, algae, or moss | Chronic moisture issues that encourage several water-loving weeds |
Once you match several of these clues, you can stop guessing and plan around one target weed. Correct identification matters because lawn-safe products list specific species on the label, and hand removal techniques differ between spreading and clumping plants.
How To Get Rid Of Dollar Weed In Garden? Step-By-Step Plan
Before reaching for a sprayer, step back and look at the site as a whole. The phrase how to get rid of dollar weed in garden? is really a question about water, soil, light, and plant density. When you fix those pieces, herbicides and hand pulling require far less effort.
Step 1: Check Water And Drainage
Start with irrigation. Measure how long sprinklers run and how deeply water soaks into the soil. Many lawns and borders only need about an inch of water per week, including rainfall, and research has shown that reducing irrigation alone can cut dollar weed populations. If you see puddles or your shoes sink into soft spots hours after watering, shorten run times and space out days between cycles.
Next, deal with drainage. In low patches, topdress with a mix of compost and sand or fine gravel so the surface sits higher than surrounding turf. Redirect downspouts away from beds that collect water. In heavy clay, loosening soil between plants with a fork or broad trowel helps air and water move through, which makes conditions less friendly for this weed.
Step 2: Strengthen Soil And Garden Beds
Dollar weed slides into weak soil that has low organic matter and few roots from desirable plants. Spread one to two inches of compost over bare garden areas, then mix it into the top several inches where you can work without harming established roots. This improves structure and makes it easier for ornamentals and lawn roots to form dense networks that crowd out invaders.
In turf borders, many extension specialists recommend raising mowing height according to the grass species. Taller grass shades the soil surface and reduces the light that dollar weed needs to photosynthesize. The HGIC dollarweed fact sheet explains that proper mowing and reduced watering are the first line of defense before any chemical treatment.
Step 3: Hand Remove Plants With Roots
Hand removal works well in planting beds where plants grow with gaps between them. Moist soil makes the job easier, so water lightly the day before or work after rain once the surface is damp but not sticky. Slide a narrow weeding knife, trowel, or hori-hori tool under the clump, following the white stems that run sideways through the soil.
Lift slowly and try to keep runners intact. Each segment that stays behind can sprout. Shake off soil so you can see stems and fine roots, then place the entire mass into a bucket or bag. Do not leave pulled plants on the soil, since nodes can root again in a day or two under warm, wet conditions.
Step 4: Mulch To Block New Sprouts
After a round of pulling, you want to block light from any remaining fragments and from new seeds. Spread a mulch layer about two to three inches thick around shrubs, trees, and perennials, keeping it a small distance away from stems and trunks. Shredded bark, pine straw, or leaf mold each work well, as long as they are clean and free of weed pieces.
In paths or tight borders, you can lay cardboard or several sheets of unwaxed paper over damp soil before adding mulch. This barrier layer slows regrowth from runners and helps starve roots by excluding light. Replace or patch mulch whenever you see the surface thinning and bare patches forming.
Step 5: Tidy Edges And Borders
Lawns and garden beds share space, and dollar weed uses that edge as a highway. Cut a clean spade edge or install a shallow physical border where turf meets beds. A six- to eight-inch-deep strip of steel or rigid plastic edging blocks runners that try to slide in from the lawn or sneak out into the grass.
During regular mowing, scan that edge for fresh round leaves. Small patches are quicker to pull or spot-treat than mats that reach under shrubs and around drip lines. A few minutes every week keeps the problem small instead of turning into a weekend project.
Getting Rid Of Dollar Weed In Your Garden Beds Safely
Cultural work often handles early outbreaks. When patches are dense or woven through turf, many gardeners add herbicides to the plan. The goal is to weaken dollar weed while protecting lawn grasses and ornamentals, then let healthier turf and bed plants fill the open space. The UF/IFAS Gardening Solutions dollarweed guide notes that both selective and non-selective products can control this weed when labels are followed closely.
Spot-Treating In Garden Beds
In mixed beds, non-selective herbicides that kill any green tissue can work if you apply them carefully. Shield nearby foliage with cardboard or a plastic sheet while spraying, or use a sponge applicator that wipes solution directly onto dollar weed leaves. Apply on a dry day with little wind, and avoid drift onto desirable plants.
Read the label for waiting periods before planting seeds or new transplants in treated spots. Some active ingredients linger in soil and can affect sensitive ornamentals. When in doubt, treat a small area first and watch how existing plants respond over several weeks.
Selective Herbicides For Lawns
In turf, selective broadleaf herbicides allow you to treat patches without killing grass. Many products for warm-season lawns contain active ingredients such as atrazine, metsulfuron, or blends with 2,4-D and dicamba that list dollar weed on the label. Extension publications stress applying these sprays to young, actively growing weeds after the lawn has fully greened up in late spring.
Follow mixing rates carefully and respect limits on how many times per year you can treat the same area. Some products are not safe for certain grasses, so always match the label to your turf type. Avoid spraying when temperatures exceed label ranges, since stressed grass may show injury.
Timing Sprays With Growth Cycles
Dollar weed grows as a warm-season perennial. It wakes as soil warms in spring, spreads through summer, and slows when cool weather returns. Pre-emergent products can reduce seed germination, while post-emergent sprays knock down actively growing leaves and stems. Combining both tools across the season lowers the seedbank and weakens existing mats.
This is another place where the phrase how to get rid of dollar weed in garden? depends on patience. One pass with a sprayer rarely solves a long-standing infestation. Plan on repeat visits at label intervals and pair each spray with steps that help turf and ornamentals recover.
Common Herbicide Options For Dollar Weed
| Active Ingredient | Typical Use Area | Notes |
|---|---|---|
| Atrazine | St. Augustinegrass, centipedegrass | Pre- and post-emergent action; avoid new seedings and follow annual rate limits |
| Metsulfuron | Warm-season lawns | Very effective on dollar weed; often needs repeat, low-rate treatments |
| 2,4-D Combinations | Many established lawns | Broadleaf mixes with dicamba or MCPP; check turf species on the label |
| Triclopyr | Turf and some woody areas | Strong on many broadleaf weeds; avoid drift onto desirable shrubs and trees |
| Non-Selective Herbicides | Bed edges, paths, cracks | Kill any green plant; best for spot wiping or shielded spraying |
| Pre-Emergent Herbicides | Lawns before seed germination | Help stop new seedlings; pair with cultural practices for best effect |
| Organic Contact Sprays | Small patches in beds | Burn down top growth; regrowth is common without follow-up pulling |
For each option, local labels and rules come first. Rates, timing, and turf safety vary by region. When you have questions about a product, ask your county or state extension office for guidance that fits your grass type and climate.
Common Mistakes That Help Dollar Weed Spread
Many gardeners fight this weed for years because of small habits that keep conditions ideal for it. Learning what to avoid can save time, money, and frustration. The most common pattern is watering too often. Shallow, daily watering keeps the surface damp while roots stay near the top of the soil, which suits dollar weed better than deep-rooted turf.
Another misstep is mowing too short. Scalped grass lets light reach the soil, warms the surface, and opens bare spots. Combine that with heavy nitrogen fertilizer and you create lush, soft growth that weakens during heat or drought, leaving more gaps for weeds. Fertilize according to soil tests and product labels instead of guessing.
Rototilling infested soil can also make the issue worse. Each chopped stem node can turn into a new plant, which means one patch becomes many scattered sprouts. For beds with dense mats, it is safer to strip the top layer, remove as many roots as possible, and then rebuild the bed with clean soil and mulch.
Simple Maintenance Habits That Keep Dollar Weed Away
Once you have reduced existing patches, steady habits keep them from rebounding. Water deeply but not often, letting the top few inches of soil dry slightly between cycles. Adjust irrigation seasonally instead of leaving timers set to one schedule all year.
Stick with higher mowing heights suited to your turf species, and sharpen blades so grass heals quickly after each cut. Feed lawns and beds only as soil tests suggest, and avoid spreading fertilizer right before heavy rain that can wash nutrients into low, wet areas.
Walk your garden and lawn once a week with a small bucket and a hand tool. Snag any new round leaves before they link up. That short walk, paired with the steps above, turns dollar weed from a constant headache into an occasional task.