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Euphorbia serpens

creeping spurge

Euphorbiaceae

North America, Central America, South America

Deer Resistant Drought Tolerant

Native to North America

SunFull Sun

WaterVery Low · drought-tolerant

Overview

Euphorbia serpens is a prostrate, mat-forming summer annual in the spurge family (Euphorbiaceae) reaching only 1-3 inches (2.5-8 cm) tall but spreading 6-18 inches (15-45 cm) wide. Stems are slender, smooth, freely branching, prostrate, radiating from a central taproot, and exude milky white latex when broken. Leaves are opposite, small, round to broadly oval, 0.1-0.25 inch (3-6 mm) long, smooth, green to gray-green, with entire margins and very short petioles. The cyathia (specialized Euphorbia spp. flower structures) are tiny, solitary in the leaf axils, with four minute white petal-like appendages on the nectar glands. Fruit is a smooth, three-lobed capsule 0.04-0.06 inch (1-1.5 mm) in diameter, containing three smooth seeds. A single plant produces 500-3,000 seeds. Plants form flat, tight mats on sidewalks, driveways, pavement cracks, compacted soils, and gravel surfaces, and tolerate foot traffic and heat-stressed environments. The milky latex causes skin and eye irritation on contact. E. serpens is native to the Americas and functions as a weed in hardscape and container nursery settings.

Native Range

Euphorbia serpens is native to North, Central, and South America, occurring from the southern United States through Mexico and into South America. Found in hot, dry, disturbed sites including sidewalk cracks, driveways, gravel lots, compacted pathways, and container nursery surfaces from sea level to approximately 5,000 feet (1,500 m). Naturalized in parts of southern Europe and Australia.

Suggested Uses

Used in weed identification courses for teaching prostrate Euphorbia spp. species differentiation (E. serpens, E. maculata, E. prostrata). Studied in heat-island weed ecology and hardscape vegetation dynamics. Included in Euphorbiaceae cyathium morphology exercises.

How to Identify

Separated from Euphorbia maculata (spotted spurge) by the smaller, rounder leaves without the central dark blotch, the completely smooth (glabrous) stems versus hairy stems, and the smaller overall plant size. Separated from E. peplus (petty spurge) by the prostrate versus erect habit. All parts exude milky white latex when broken. The very small, smooth, round leaves 0.1-0.25 inch (3-6 mm) long and the tight, flat mat habit on hot surfaces are diagnostic.

Appearance

Size & Dimensions

Height1" - 3"

Width/Spread6" - 1'6"

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~12 weeks

Summer Fall

Flowers appear June through October. Cyathia are produced continuously in the leaf axils as stems elongate. Individual cyathia mature over 3-5 days. Capsules dehisce 2 weeks after pollination. The species is self-pollinating. In the Pacific Northwest, flowering begins when soil temperatures consistently exceed 65°F (18°C) in late spring.

Detailed Descriptions

Flower Description

Green to white cyathia in leaf axils with minute white petal-like appendages

Foliage Description

Green to gray-green, small, round to broadly oval, smooth, opposite, with entire margins

Growing Conditions

Sun Requirements

SunFull Sun

Requires 6-12 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range5.5 - 8.0(Neutral)

357912

Soil Types

sand loam silt rocky

Drainagewell drained

Water & Climate

Water Needs

Very Low

Frost Tolerance

tender

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Hand-pulling before capsule formation works; the shallow taproot extracts easily from cracks and loose substrate. Plants tolerate heat and drought on pavement surfaces where few other species persist. Pre-emergent management in nursery container surfaces and gravel areas reduces establishment. Dense gravel or stone mulch does not prevent germination, since seeds lodge in gaps between particles. The annual life cycle means plants do not persist through freezing winters, so management is seasonal in the Pacific Northwest. Latex causes skin irritation on contact, and residue on bare skin requires washing before touching the face or eyes.

Pruning

Pruning is not applicable. Plants are removed by pulling or scraping from hard surfaces. The prostrate, mat-forming habit allows scraping with a hoe or flat-edged tool on pavement and gravel. Removing plants before capsule maturity prevents seed bank replenishment.