Prostrate Spurge (Euphorbia supina)

Prostrate Spurge

Euphorbia supina

A resilient, mat-forming summer annual known for its milky sap and red-spotted leaves, often thriving in pavement cracks. Other names: Spotted spurge.

Requires full sun to thrive, though it can tolerate partial shade.
1/week
Beginner
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Plant Needs

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Sunlight Requires full sun to thrive, though it can tolerate partial shade.
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Watering Highly drought-tolerant; requires minimal watering once established.
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Temperature Thrives in hot summer temperatures; killed by the first autumn frost.
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Characteristics

  • Leaves: Opposite, small (up to 1.5 cm long), oval to oblong, often featuring a distinctive purplish-red spot in the center, with slightly serrated margins;
  • Stems: Prostrate, highly branched, forming flat mats, pink to red in color, hairy, exuding a milky white latex sap when broken;
  • Flowers: Tiny, inconspicuous cyathia clustered in leaf axils, lacking true petals but having white to pinkish petal-like appendages;
  • Fruit: Small, 3-lobed hairy capsules containing tiny seeds.
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Care Guide

Watering

Water sparingly, allowing the soil to dry out completely between waterings.

Fertilization

No fertilization required.. This plant thrives in nutrient-poor soils and generally does not require supplemental feeding.

Banana peel water:Soak chopped banana peels in water for 24 hours. Dilute 1:1 with water. Note: As a weed, it rarely needs fertilizer, but this can be used if cultivated. Always wear gloves when handling the plant to avoid toxic sap.
Pruning
  • Hand-pull to control unwanted spread before it sets seed;
  • Always wear protective gloves to prevent skin contact with the irritating milky sap;
  • Do not mow, as its prostrate habit allows it to evade mower blades.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Toxic per ASPCA. Ingestion or contact with the sap can cause oral irritation, vomiting, and diarrhea.

Humans: The milky sap contains diterpene esters that can cause severe contact dermatitis, eye irritation, and gastrointestinal distress if ingested.

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Garden Uses & Culture

Culture: Often viewed as a persistent and ubiquitous weed in lawns, gardens, and pavement cracks across the Americas, symbolizing resilience in harsh urban environments.

Usage: - Pioneer species in disturbed soils; - Occasionally used as a ground cover in extreme xeriscaping, though usually considered a weed.