Cactus Pencil (often called Pencil Cactus, scientific name: Euphorbia tirucalli) is a striking succulent with thin, stick-like green stems that can turn reddish in bright sunlight. It’s super low-maintenance, but it does require some specific care — especially because it’s technically not a true cactus but a type of Euphorbia.
🌿 Pencil Cactus Care Guide (Euphorbia tirucalli)
☀️ Light
Best: Full sun to bright, indirect light.
Tolerates: Lower light indoors, but growth will slow and color may fade.
Outdoors? Yes, in warm climates (USDA zones 10–12).
🔆 The more sun it gets, the more red/orange the tips may turn ("Firestick" effect).
💧 Water
Water when: Soil is completely dry.
How often: Every 2–3 weeks in summer; once a month (or less) in winter.
Avoid: Overwatering – it's drought-tolerant but not rot-tolerant.
🪣 Water less if indoors with low light or in cooler months.
🌡️ Temperature & Humidity
Temperature: 65–85°F (18–29°C). Can tolerate higher temps.
Humidity: Prefers dry air. No special humidity needs.
Cold sensitive: Keep above 50°F (10°C). Frost will damage or kill it.
🌱 Soil
Type: Well-draining cactus/succulent mix. Add perlite or sand if needed.
Drainage: Pot must have drainage holes.