Hybrid Pencil Cactus (Euphorbia tirucalli × Euphorbia stenoclada)

Hybrid Pencil Cactus

Euphorbia tirucalli × Euphorbia stenoclada

Milky sap guards its slender, branching form. Evergreen succulent hybrid; common name: Hybrid Pencil Cactus.

Full sun
1/week
Beginner
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Plant Needs

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Sunlight Bright full sun to partial sun; tolerate direct sunlight but avoid midday scorching in peak summer
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Watering Allow soil to dry completely between waterings to prevent root rot; avoid overwatering
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Temperature Thrives in 18–30℃; protect from frost and temperatures below 10℃ to prevent stem damage
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Characteristics

  • Leaf: Tiny, scale-like leaves that drop quickly, leaving cylindrical green stems as primary photosynthetic structures
  • Stem: Slender, branching green stems containing toxic milky latex sap
  • Inflorescence: Small, inconspicuous cyathia (typical Euphorbia flowers) in leaf axils (rare indoors)
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Care Guide

Watering

Water when the top 5–7 cm of soil is fully dry

Fertilization

Diluted balanced succulent feed once monthly. Use low-nitrogen feed to avoid promoting soft, leggy growth

Composted coffee grounds tea:Use fully composted grounds diluted 1:40 for root drenching; avoid raw grounds to prevent soil acidity spikes and pest issues
Pruning
  • Wear protective gloves to avoid contact with toxic milky sap during pruning
  • Trim leggy stems in early spring to maintain a compact, branching form
  • Remove dead or damaged stems to improve airflow and reduce disease risk
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; sap irritates mouth, skin, and eyes; ingestion causes vomiting and diarrhea

Humans: Milky sap causes skin and eye irritation; ingestion leads to mild gastrointestinal discomfort

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental succulent for xeriscaping, container gardening, or indoor decor