Repotting guide

When & how to repot Euphorbia tirucalli 'Firesticks' (Euphorbia tirucalli 'Firesticks')

Also called firesticks, red pencil tree, sticks on fire.

More about euphorbia tirucalli 'firesticks'

About Euphorbia tirucalli 'Firesticks'

Euphorbia tirucalli 'Firesticks' · also called firesticks, red pencil tree · houseplant

Euphorbia tirucalli 'Firesticks' is a near-leafless succulent of slender pencil-thick stems that flush coral, orange and red in bright light and cool weather, greening up in shade. It thrives on neglect in fast-draining soil and full sun, but its caustic milky sap is hazardous, so handle it with care.

Mature size: Reaches 1.2-2m or more in containers over time; readily pruned to stay compact and bushy.

How to tell euphorbia tirucalli 'firesticks' needs repotting

Repotting on a calendar is less reliable than reading the plant. For euphorbia tirucalli 'firesticks', watch for these signs:

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot euphorbia tirucalli 'firesticks'

Every 2–3 years, into bone-dry mix. Euphorbia tirucalli 'Firesticks''s growth habit — upright, densely branching shrub of thin, smooth, pencil-like cylindrical stems, almost leafless; new growth flushes coral to scarlet, deepening in cool, bright conditions. — sets the pace. Euphorbia tirucalli 'Firesticks' is a near-leafless succulent of slender pencil-thick stems that flush coral, orange and red in bright light and cool weather, greening up in shade. It thrives on neglect in fast-draining soil and full sun, but its caustic milky sap is hazardous, so handle it with care.

What size pot to step euphorbia tirucalli 'firesticks' up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Euphorbia tirucalli 'Firesticks' stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot euphorbia tirucalli 'firesticks'

Spring or summer, while euphorbia tirucalli 'firesticks' is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting euphorbia tirucalli 'firesticks'

Repot dry. Do not water euphorbia tirucalli 'firesticks' for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty free-draining cactus and succulent mix ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set euphorbia tirucalli 'firesticks' at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep euphorbia tirucalli 'firesticks' completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for euphorbia tirucalli 'firesticks'

Euphorbia tirucalli 'Firesticks' wants free-draining cactus and succulent mix. A gritty cactus compost amended with pumice, perlite or coarse sand. Sharp drainage is essential; the plant resents heavy, water-retentive soils and is happy in lean, poor mixes. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting euphorbia tirucalli 'firesticks' — frequently asked questions

How often should you repot euphorbia tirucalli 'firesticks'?

Every 2–3 years, into bone-dry mix for euphorbia tirucalli 'firesticks'. Repot euphorbia tirucalli 'firesticks' every 2–3 years into a snug pot of free-draining cactus and succulent mix, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does euphorbia tirucalli 'firesticks' need?

When is the best time of year to repot euphorbia tirucalli 'firesticks'?

Should you water euphorbia tirucalli 'firesticks' after repotting?

No — not straight away. Repot euphorbia tirucalli 'firesticks' into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise euphorbia tirucalli 'firesticks' after repotting?

Not immediately. Wait about 3 weeks after repotting euphorbia tirucalli 'firesticks'. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.