Repotting guide

When & how to repot Euphorbia ingens (Euphorbia ingens)

Also called candelabra tree, naboom.

More about euphorbia ingens

About Euphorbia ingens

Euphorbia ingens · also called candelabra tree, naboom · houseplant

A large, tree-like succulent spurge from southern Africa, forming a stout trunk topped with upright, four-ribbed green branches that create a candelabra silhouette. Architectural and fast-growing as a houseplant when young, it becomes a substantial specimen with age. Its copious milky latex is highly toxic and caustic, so it demands careful handling away from children and pets.

Mature size: Can exceed 8-12 m in the wild; container plants are usually kept to 1-2 m, though they grow steadily.

Watch for — Toppling and weak growth: In low light tall stems grow weak and lean, and large plants become top-heavy. Provide strong light and a heavy, stable pot, repotting only when needed.

How to tell euphorbia ingens needs repotting

Repotting on a calendar is less reliable than reading the plant. For euphorbia ingens, 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 ingens

Every 2–3 years, into bone-dry mix. Euphorbia ingens's growth habit — tree-like, multi-branched columnar succulent with a thick trunk and upright four-angled ribbed branches forming a candelabra crown; can become very large with age. — sets the pace. A large, tree-like succulent spurge from southern Africa, forming a stout trunk topped with upright, four-ribbed green branches that create a candelabra silhouette. Architectural and fast-growing as a houseplant when young, it becomes a substantial specimen with age. Its copious milky latex is highly toxic and caustic, so it demands careful handling away from children and pets.

What size pot to step euphorbia ingens up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Euphorbia ingens 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 ingens

Spring or summer, while euphorbia ingens 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 ingens

Repot dry. Do not water euphorbia ingens 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 ingens 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 ingens 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 ingens

Euphorbia ingens wants free-draining cactus and succulent mix. A gritty blend of cactus compost with sand, perlite or pumice. Good drainage and a heavy, stable pot are important, as large specimens become top-heavy. 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 ingens — frequently asked questions

How often should you repot euphorbia ingens?

Every 2–3 years, into bone-dry mix for euphorbia ingens. Repot euphorbia ingens 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 ingens need?

When is the best time of year to repot euphorbia ingens?

Should you water euphorbia ingens after repotting?

No — not straight away. Repot euphorbia ingens 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 ingens after repotting?

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