Spurge in Warm-Season Lawns: Complete Guide
Spurge is a low-growing summer weed that forms dense mats in thin, stressed Florida lawns. Its milky sap and rapid spreading make it a persistent nuisance.
What Spurge Looks Like
Spurge encompasses several Euphorbia species that commonly invade Florida lawns, with Spotted Spurge (Euphorbia maculata) and Prostrate Spurge (Euphorbia prostrata) being the most common. These low-growing summer annuals form dense mats that hug the ground, spreading outward from a central taproot.
Spotted Spurge is identifiable by its small, oval leaves (about 1/4 inch) with a distinctive reddish-brown spot in the center of each leaf. The leaves are opposite, meaning they grow in pairs on either side of the stem. Prostrate Spurge looks similar but lacks the leaf spots. Both species have reddish stems and tiny, inconspicuous flowers.
All Spurge species produce a milky white sap when stems or leaves are broken - this is a key identifying feature. The sap can cause skin irritation in sensitive individuals. This milky latex is characteristic of the Euphorbia family and distinguishes Spurge from similar-looking low-growing weeds.
Spurge thrives in hot, dry conditions and is most problematic in thin, stressed lawns, driveways, sidewalk cracks, and other compacted areas. It germinates in late spring when soil temperatures warm and grows rapidly through summer, producing abundant seeds before dying with the first frost. The seeds persist in soil to restart the cycle next year.
Warm-Season Grasses Affected
When It Strikes in the South
Spurge germinates in Florida from April through summer when soil temperatures reach 75°F. It grows aggressively from May through October, producing seeds continuously through the season. Plants die with cool fall temperatures but seeds survive winter. Pre-emergent application in late March to April is the best prevention timing.
How to Confirm Spurge
- 1Look for low-growing, mat-forming plants spreading from a central point
- 2Check for small opposite leaves, possibly with a dark spot in the center (Spotted Spurge)
- 3Break a stem and look for milky white sap - a defining characteristic
- 4Note the reddish color of stems, especially on mature plants
- 5Observe that the weed is concentrated in hot, dry, compacted areas
Treatment Steps for Spurge
- 1
Hand-pull small infestations while plants are young, before they produce seeds
- 2
Apply a post-emergent broadleaf herbicide containing 2,4-D, dicamba, or triclopyr
- 3
For best results, treat young, actively growing plants before they mature and set seed
- 4
Use a surfactant to improve herbicide adhesion to the small, waxy leaves
- 5
Apply pre-emergent herbicide next spring to prevent germination
- 6
Address underlying lawn stress (compaction, thin turf, drought) that allows Spurge to establish
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Prevention Tips
- ✓Apply pre-emergent herbicide in late March to early April before Spurge germinates
- ✓Maintain thick, healthy turf to shade out Spurge seedlings
- ✓Core aerate compacted soils that favor Spurge establishment
- ✓Water appropriately - drought stress weakens grass and favors Spurge
- ✓Remove Spurge plants before they set seed to reduce next year's seed bank
- ✓Fill bare spots and thin areas quickly before Spurge colonizes them
Frequently Asked Questions
Is Spurge sap dangerous?▼
Spurge sap can cause skin irritation, redness, and itching in sensitive individuals. Wear gloves when hand-pulling Spurge. If sap contacts skin, wash immediately with soap and water. The sap is more irritating than truly dangerous for most people, but avoid contact with eyes and wash hands before touching your face.
Why does Spurge grow in my driveway cracks but not my lawn?▼
Spurge thrives in hot, dry, compacted conditions like driveway cracks, sidewalks, and gravel. These harsh environments favor Spurge over other plants. In healthy, well-watered lawns with good turf density, grass outcompetes Spurge. The weed appears in lawns only where grass is thin, stressed, or absent.
Will Spurge spread to my whole lawn?▼
Spurge can spread across thin, stressed lawns but struggles in dense, healthy turf. Each plant can produce thousands of seeds, so untreated infestations worsen over time. However, improving your lawn's health through proper watering, fertilization, and mowing will make it more resistant to Spurge invasion.
Can I just mow over Spurge to get rid of it?▼
No, mowing won't eliminate Spurge. The mat-forming growth habit means most of the plant lies below the mower blade height. Spurge continues growing, flowering, and producing seeds despite regular mowing. Hand-pulling, herbicides, or pre-emergent prevention are needed for control.
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