Pencil Cactus Plant Care

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.

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.

Pencil Cactus thrives in full sun to partial shade.

Euphorbia tirucalli tolerates temperatures of 60–85°F. Pencil Cactus prefers humidity levels of 40–60%.

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.

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.

The PlantoScan app can remind you when to water and when to fertilize each plant.

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.

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.

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.

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.

Pencil Cactus can be propagated through stem cuttings, offsets, seeds. Similar propagation techniques also apply to poinsettia plant care, which shares the same genus.

See all plants toxic to cats and plants toxic to dogs.

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.

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.