
Photo: Alan MansonCC BY 4.0via iNaturalistresized / cropped
Pencil Cactus Plant Care
Euphorbia tirucalli L.
Updated · Sources · How we source care data
Euphorbia tirucalli is a tree native to Africa that grows in semi-arid tropical climates. A hydrocarbon plant, it produces a poisonous latex that can cause temporary blindness.
Every 14–21 days
Full sun to partial shade
60–85°F
40–60%
At a glance
How do you care for Pencil Cactus?
Plant Pencil Cactus in full sun to partial shade (USDA zones 9b–11b) and water a young shrub every 14–21 days until it is established. It tolerates temperatures of 60–85°F (16–29°C). Fertilize it every 6 months during the growing season. The ASPCA lists it as toxic to cats and dogs, so keep it out of reach of pets.
Where Is the Pencil Cactus Native To?
- Algeria
- Angola
- Benin
- Botswana
- Burkina Faso
- Burundi
- Cameroon
- Cape Verde
- Central African Republic
- Chad
- Côte d'Ivoire
- Djibouti
- DR Congo
- Egypt
- Equatorial Guinea
- Eritrea
- Eswatini
- Ethiopia
- Gabon
- Ghana
- Guinea
- Guinea-Bissau
- Kenya
- Lesotho
- Liberia
- Libya
- Madagascar
- Malawi
- Mali
- Mauritania
- Morocco
- Mozambique
- Namibia
- Niger
- Nigeria
- Republic of the Congo
- Rwanda
- Sao Tome and Principe
- Senegal
- Sierra Leone
- Somalia
- South Africa
- South Sudan
- Sudan
- Tanzania
- The Gambia
- Togo
- Tunisia
- Uganda
- Zambia
- Zimbabwe
What Is the Pencil Cactus?
Pencil Cactus (Euphorbia tirucalli) belongs to the Euphorbiaceae family within the Euphorbia genus. Pencil Cactus is native to Africa that grows in semi-arid tropical climates. Pencil Cactus is also known as Fire Sticks, Milk Bush, Sticks of Fire.
Pencil Cactus displays a varies by species, can be upright, sprawling, or clumping growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Pencil Cactus produces small, often inconspicuous flowers surrounded by colorful bracts.
Leaf size: approximately 4 inches.
How Often Should You Water a Pencil Cactus?
Water a young or newly planted Pencil Cactus every 14–21 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established shrubs mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.
Watering Frequency
Every 14–21 days
Until established; then in dry spells
What Light Does the Pencil Cactus Need?
Pencil Cactus thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Pencil Cactus Prefer?
Euphorbia tirucalli tolerates temperatures of 60–85°F. Pencil Cactus prefers humidity levels of 40–60%.
Temperature
60–85°F
Humidity
40–60%
What Soil Mix Works Best for a Pencil Cactus?
Well-draining sandy soil mix with perlite and gravel. Good drainage is essential for Pencil Cactus to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Pencil Cactus?
Feed Pencil Cactus every 6 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established shrubs in good soil often need little extra feeding, so let weak growth or pale foliage guide you.
Stop feeding by late summer so new growth can harden before winter.
Fertilizing
Every 6 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
Where Should You Plant a Pencil Cactus?
Choose a spot with full sun to partial shade and well-draining sandy soil mix with perlite and gravel. Avoid low spots where water collects after rain.
Pencil Cactus is suited to USDA Zone 9b – 11b.
Plant container-grown or balled-and-burlapped shrubs in spring or early autumn, setting the root flare at soil level, and water well after planting.
How Far Apart Should You Plant a Pencil Cactus?
Pencil Cactus can spread to about 2 ft (0.6 m) and reach about 3 ft (1 m) tall. Space plants about 2 ft (0.6 m) apart so mature crowns don't crowd each other, and plant at least half that distance from buildings, fences and paths.
Planning a row or hedge? Try the plant spacing calculator.
How Do You Prune a Pencil Cactus?
Prune Pencil Cactus while it is dormant in late winter: first remove dead, damaged and crossing branches, then thin lightly for shape.
If it flowers in spring, prune right after flowering instead so you don't remove next year's buds. Never take off more than about a quarter of the shrub in one year.
How Do You Care for a Pencil Cactus in Winter?
Pencil Cactus is frost-tender (hardy to USDA zone 9). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.
How Do You Propagate a Pencil Cactus?
Pencil Cactus can be propagated through stem cuttings, offsets, seeds. Similar propagation techniques also apply to poinsettia plant care, which shares the same genus.
Is the Pencil Cactus Toxic to Pets and Children?
Toxic to cats and dogs
Source: ASPCA Animal Poison Control Center plant list. View the ASPCA entry
Mildly toxic if ingested, can cause skin irritation
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Pencil Cactus?
Pencil Cactus is susceptible to mealybugs, spider mites, aphids. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Pencil Cactus Need?
Pencil Cactus grows outdoors in USDA Zone 9b – 11b. It survives winters down to planting zone 9b. Pencil Cactus is native to Africa that grows in semi-arid tropical climates. In cooler regions, grow Pencil Cactus as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 9b – 11b
Keep exploring plants
Pencil Cactus is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Euphorbia genus — compare its care with other Euphorbia species on PlantoScan.
Euphorbia is part of the Euphorbiaceae plant family — browse all Euphorbiaceae genera and species.
Pencil Cactus thrives in bright light and direct sun — see other bright-light plants.
More Euphorbia Species
Other Euphorbia species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Euphorbia tirucalli L., family Euphorbiaceae (first published in Sp. Pl. : 452 (1753)) — World Flora Online record, IPNI name record, Wikidata.
- Pet toxicity: The ASPCA lists Pencil Cactus as toxic to cats and dogs. Source: ASPCA Toxic and Non-Toxic Plant List.
- Photo: Alan Manson, CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 9b – 11b, estimated from the plant's typical growing conditions.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
