Ridge-seed Spurge (Euphorbia glyptosperma)

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Sunlight Full sun to partial shade; thrives in open, unshaded wild habitats with minimal competition

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Watering Highly drought-tolerant; water only during extended multi-week dry periods to avoid root rot

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Temperature Hardy to mild winter frosts; performs best in warm, dry summer temperatures between 20–30°C

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Leaf: Narrow oblong to linear leaves, 1–3 cm long, arranged oppositely along slender stems
Flower: Tiny greenish-yellow cyathia clustered in leaf axils, lacking distinct true petals
Stem: Slender branching stems that exude milky white sap when damaged

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Watering

Water sparingly only when top 5 cm of soil is completely dry

Fertilization

No regular fertilization required. Tolerates nutrient-poor soils; over-fertilization may encourage excessive leggy growth

Eggshell powder top-dress：Sprinkle finely crushed, dried eggshells around plant bases to add calcium without disrupting low-nutrient soil conditions

Pruning

Remove spent flower clusters to reduce self-seeding if controlling spread in managed gardens
Thin overcrowded stems to improve airflow and reduce fungal disease risk
Pull entire plants by the root to eliminate unwanted growth in cultivated beds

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Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; milky sap causes oral irritation, vomiting, and diarrhea

Humans: Mild skin irritation from milky sap contact; mild gastrointestinal upset if ingested

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Culture: N/A

Usage: N/A