Estimated reading time: 10 to 12 minutes
Spurge is a low-growing summer annual in the genus Euphorbia that spreads a dense mat across thin lawns, sidewalk cracks, and garden beds. To kill it fast, hand-pull young plants (wear gloves, the milky sap is a skin irritant), spot-treat mature patches with a selective broadleaf herbicide labeled for spurge, and apply a pre-emergent like prodiamine in late winter to stop next year's spurge seeds from sprouting. Thicken the lawn to keep it out for good.
Spotted spurge (Euphorbia maculata) fans out from a single taproot in a perfectly flat rosette, which is why mowers glide right over it. Just one seed can grow into a spurge plant that can extend its root 24 inches or more into the surrounding soil.
Spurge is one of the most common lawn weeds in North American lawns, driveways, and vegetable beds, and it is also one of the most misidentified. Home gardeners mistake it for edible purslane, pet owners overlook the toxic milky sap, and homeowners spray it with the wrong product and watch it come back thicker the next summer.
This guide walks through identification, safety, and a step-by-step control plan that works in cool-season turf, warm-season turf, hardscape cracks, and food crops.
What Are Spurge Weeds?
Spurge weeds are native broadleaf summer annuals in the spurge family (Euphorbiaceae, also known as the euphorbia family) that germinate when soil surface temperatures hit about 60°F and mature in six to eight weeks. All spurges leak a milky sap when a stem is broken, which is the single fastest way to confirm an ID in the field. For a wider survey, see our full guide to common broadleaf lawn weeds.
Spurge
"Spurge" is the common name for roughly 2,000 species in the genus Euphorbia. In lawns and gardens, the problem species are the prostrate, mat-forming annuals: spotted spurge, prostrate spurge, ground spurge, and creeping spurges. All share the same tell: snap a stem and a white, latex-like sap oozes out. That sap is a skin irritant and mildly toxic to pets, which is why every control step below starts with gloves.
The milky sap is the field-diagnostic feature of every plant in the spurge family, and it is also the reason you wear gloves before pulling.
Spotted Spurge
Spotted spurge is the most common lawn spurge in the United States. Its stems radiate from a single taproot in a low, flat, dense mat that can reach 3 feet across but rarely stands more than half an inch off the soil. Leaves are small, oval, pale green to dark green, with a distinctive reddish or purple spot in the leaf centers.
Leaf margins are rounded at tips, but can be slightly serrated. Spotted spurge stems are pinkish-red and slightly hairy. Inconspicuous flowers cluster in the leaf axils in late summer. If you know your turf, you will spot spurge fastest in thin lawns and compacted strips along walkways and roadsides. Not sure what you are growing? Identify your lawn grass type first.
Euphorbia Maculata
Euphorbia maculata is the scientific name for spotted spurge, sometimes also called spotted sandmat or milk purslane. The University of Wisconsin turfgrass program notes that a single plant can produce several thousand spurge seeds in one season, which is why one missed patch this year becomes a lawn-wide problem next year.
Chamaesyce Maculata
You will also see spotted spurge listed as Chamaesyce maculata. That is the older name. Botanists split the prostrate mat-forming spurges into the genus Chamaesyce for years, then merged them back into the larger genus Euphorbia based on genetic evidence. Penn State Extension and UC IPM both cross-reference the two names, so Chamaesyce maculata and Euphorbia maculata are the same species. Product labels sometimes still list the older name.
Spurge Life Cycle
Spurge is a summer annual. Here is the life cycle in one glance:
|
Stage |
Timing |
What's happening |
|---|---|---|
|
Germination |
Late spring, soil at 60–75°F |
Spurge seeds sprout in bare or compacted soil in full sun |
|
Vegetative |
Early to mid-summer |
Dense mat expands from one taproot; low-growing plant hugs the ground |
|
Flowering |
Mid to late summer |
Tiny flower clusters form in the leaf axils |
|
Seed set |
Late summer to first frost |
One plant can produce tens of thousands of seeds |
|
Dormant |
Fall through winter |
Seeds remain dormant in the soil, then germinate the following spring |
Every spurge control decision maps to a stage in this life cycle: pre-emergents hit germination, hand pulling hits vegetative, mulches and thick turf block the light plants need to emerge.
Are Spurge Weeds Dangerous?
Yes, mostly because of the milky sap. Spurge is not on the ASPCA's most-dangerous list, but the sap irritates skin, eyes, and mucous membranes in people and pets, and heavy ingestion can cause vomiting and diarrhea in dogs, cats, and livestock.
Pets and People
Rub spurge sap on bare skin, and you may see redness, itching, or a rash within a few hours. Rub it in your eyes, and you have a real problem: the sap is a known ocular irritant. Dogs and cats that chew a mouthful of spurge usually drool, vomit, or paw at their mouths. Deaths are rare, but grazing animals in pastures with heavy spurge infestations have been poisoned. If you have a curious dog, keep the yard mowed and see our pet-safe lawn care guide before you spray anything.
Skin Irritant
Always wear gloves. Long sleeves help. If sap touches skin, wash with soap and cool water. If it gets in your eyes, flush for 15 minutes and call poison control or an eye doctor.
Food Crops
This is where spurge causes the biggest confusion. Spotted spurge and purslane grow side by side, look almost identical from a distance, and gardeners routinely toss both into salads. Purslane is edible. Spurge is not. The two easy field tests:
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Sap test. Snap a stem. White sap means spurge. Clear juice means purslane.
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Leaf test. Purslane leaves are thick, fleshy, and paddle-shaped. Spurge leaves are thin, oval, and often carry a dark spot in the leaf centers.
Never eat any low-growing plant with milky sap. In vegetable beds, pull spurge before it flowers so it does not shed seeds into the soil near your food crops.
Purslane (left) has fleshy paddle-shaped leaves and clear juice. Spotted spurge (right) has thin oval leaves, spotted leaf centers, and milky sap. Only one is safe to eat.
Why Spurge Appears
Spurge is an opportunist. It shows up wherever three conditions overlap: thin turf, compacted soil, and full sun. That is why it colonizes sidewalk cracks, driveway edges, mulched areas that have washed out, and the strip of lawn next to a curb where the mower scalps the grass. UC IPM points out that spotted spurge tolerates compacted soil better than most desirable plants, so it wins in any patch where the lawn is stressed.
Common triggers include:
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Bare patches from dog urine, drought, or heavy traffic
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Compacted soil under swing sets, along fences, and next to driveways
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Mowing too low, which thins the canopy
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Skipping fall overseeding and letting the lawn thin over winter
Fix the underlying weakness, and you cut off spurge at the source. Start with overseeding a thinning lawn and a spring lawn preparation checklist.
How to Get Rid of Spurge: Step by Step
The fastest way to get rid of spurge is a four-step sequence: pull the mature plants, spot-spray what regrows, apply a pre-emergent before next spring, then thicken the turf so new plants cannot emerge.
Step 1: Hand-pull mature plants before they seed. Wear gloves. Grab spurge low on the stem and lift straight up so the full taproot and as much of the roots as possible come with it, since spurge can come back if pieces are left behind. Bag the plants. Do not compost them. Even wilted spurge can produce seed if flowers have already opened.
Step 2: Spot-treat regrowth with a selective broadleaf herbicide. Pick a product with 2,4-D, dicamba, MCPA, or a combination labeled for spurge. Spray when spurge is actively growing and under 3 inches wide, at temperatures between 60°F and 85°F. Read product labels for turf-type restrictions.
Step 3: Apply a pre-emergent in late winter. Prodiamine, dithiopyr, or isoxaben work well. See our guide on timing your pre-emergent application and the mechanics of how pre-emergent herbicides work before you spread.
Step 4: Thicken the turf. Overseed thin lawns in the fall, aerate compacted soil, mow at the top of your grass type's recommended range, and use organic mulches in garden beds and ornamental beds to block the light spurge seeds need to germinate.
Bag pulled spurge instead of composting it. Plants emerge from seeds if spurge is left to compost.
Best Products to Use for Spurge Control
Here are the products we reach for on a spurge job, matched to where the weed is growing.
|
Product |
Best for |
Notes |
|---|---|---|
|
Sidewalk cracks, driveway edges |
Ready-to-use, non-selective, kills spurge on hardscape |
|
|
Cool-season lawns |
Three-way blend, strong on prostrate spurge |
|
|
Cool weather spot spray |
Works down to about 50°F on early emergent spurge |
|
|
Heavy mats and creeping spurges |
Concentrate for large or established infestations |
|
|
Pre-emergent, late winter |
Stops spurge seeds from germinating for months |
Want more options for other weeds like dandelions and crabgrass? Browse all broadleaf weed killers and match the label to your turf type. Non-selective herbicides will damage desirable plants, so use them on cracks and bare ground only.
Reading product labels is the single most-skipped step in DIY weed control. Every label lists turf types, temperature ranges, and re-entry intervals.
Spurge Prevention Tips
Prevention is cheaper than control. Spurge produces seed prolifically, so the goal is to stop germination and starve the seed bank.
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Mow at the right height. Tall fescue and Kentucky bluegrass at 3 to 4 inches, Bermuda at 1 to 2 inches. Taller grass shades the soil surface and keeps spurge seeds from sprouting.
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Overseed thin lawns every fall. Dense turf is the best pre-emergent there is.
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Aerate compacted soil. Spurge outcompetes cool-season turf on compacted ground, but grass wins on aerated ground.
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Mulch garden beds. Two to three inches of organic mulches (bark, straw, leaf mold) block the light spurge seeds need to germinate.
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Clean lawn mowers and boots. Seeds hitchhike on animal fur, mower decks, and shoes. Rinse before you move between yards.
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Spread pre-emergent on time. Explore our pre-emergent herbicide options and look into natural weed prevention practices for organic beds.
A thick canopy is the single most effective spurge control there is. Nothing on this list matters more than mowing height.
When to Call a Professional
Call a lawn care pro when spurge covers more than 30% of the lawn, when you have tried two herbicide rotations and it keeps coming back, or when spurge is spreading through a vegetable garden and you cannot use conventional broadleaf products near food crops.
Pros bring soil tests, calibrated sprayers, restricted-use pre-emergents, and the timing knowledge to hit the germination window. If you are weighing the cost and effort, our breakdown on when to hire a lawn care pro walks through the tradeoffs.
The Bottom Line on Spurge
Spurge is beatable once you know what you are looking at. Confirm the ID by the milky sap and the reddish spot in the leaf centers, wear gloves whenever you touch it, pull mature plants before they seed, spot-spray with a selective herbicide labeled for spurge, and stop next year's crop with a late-winter pre-emergent.
Then fix the reason spurge showed up in the first place: thicken the turf, aerate compacted soil, and mulch bare ground. Ready to shop the products above? Start with the broadleaf weed control category and match the label to your lawn.
Frequently Asked Questions
Q. Is spurge poisonous to dogs?
A. Spurge is mildly toxic to dogs because of the milky sap. Chewing a mouthful usually causes drooling, vomiting, mouth irritation, or diarrhea. Deaths are rare, but keep pets off treated lawns until the spray dries and pull spurge before your dog can graze on it.
Q. Is spurge the same as purslane?
A. No. Spurge and purslane look similar from a distance, but these common weeds are not the same species. Spurge (Euphorbia maculata) has thin oval leaves, spotted leaf centers, and milky sap. Purslane has thick fleshy leaves and clear juice. Purslane is edible. Spurge is not.
Q. What kills spurge but not grass?
A. Selective broadleaf herbicides with 2,4-D, dicamba, or MCPA kill spurge without harming most lawn grasses. Cool Power and Fertilome Weed Free Zone are common examples. Always match the product to your turf type on the label.
Q. When does spurge germinate?
A. Spurge seeds germinate in late spring when soil surface temperatures reach about 60°F, and continue emerging through late summer. Apply pre-emergent herbicides two to three weeks before soil hits 55°F to stop the first flush.
Q. Will vinegar kill spurge?
A. Household vinegar burns the top of young spurge but does not kill the taproot, so plants regrow within a week. Horticultural vinegar (20% acetic acid) works better on seedlings in sidewalk cracks, but wear eye protection and keep it off desirable plants.
Q. How long do spurge seeds stay viable in soil?
A. Spurge seeds can remain dormant in the soil for several years, which is why one bad season creates weed problems for the next three or four. Consistent pre-emergent applications and a thick lawn draw down the seed bank over time.
