Repotting guide

When & how to repot Euphorbia decaryi (Euphorbia decaryi)

Also called Decary's euphorbia, Madagascar crinkle-leaf euphorbia.

More about euphorbia decaryi

About Euphorbia decaryi

Euphorbia decaryi · also called Decary's euphorbia, Madagascar crinkle-leaf euphorbia · houseplant

Euphorbia decaryi is a low, spreading Madagascan succulent forming mats of creeping stems topped with rosettes of distinctive wavy-edged, crinkled olive-green leaves. A collectors' favourite for its texture and compact habit, it asks for bright light, very gritty soil and careful watering, and spreads slowly by underground stems.

Mature size: Stays low at about 5-10cm tall, spreading gradually into a mat 20-30cm or more across over time.

Watch for — Stem and root rot: The creeping, partly buried stems rot if the soil stays wet. Use a very gritty mix, let it dry between waterings, and water sparingly in the dormant season.

How to tell euphorbia decaryi needs repotting

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

Every 2–3 years, into bone-dry mix. Euphorbia decaryi's growth habit — low, mat-forming dwarf succulent with creeping, branching, often partly buried stems that root as they spread, each tip carrying a rosette of small, wavy-margined, crinkled green leaves. — sets the pace. Euphorbia decaryi is a low, spreading Madagascan succulent forming mats of creeping stems topped with rosettes of distinctive wavy-edged, crinkled olive-green leaves. A collectors' favourite for its texture and compact habit, it asks for bright light, very gritty soil and careful watering, and spreads slowly by underground stems.

What size pot to step euphorbia decaryi up to

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

Spring or summer, while euphorbia decaryi 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 decaryi

Repot dry. Do not water euphorbia decaryi 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, gritty 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 decaryi 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 decaryi 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 decaryi

Euphorbia decaryi wants free-draining, gritty succulent mix. A gritty cactus mix amended generously with pumice, perlite or coarse sand. Sharp drainage is essential to protect the spreading rhizomatous stems from rot; a wide, shallow pot suits the mat-forming habit. 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 decaryi — frequently asked questions

How often should you repot euphorbia decaryi?

Every 2–3 years, into bone-dry mix for euphorbia decaryi. Repot euphorbia decaryi every 2–3 years into a snug pot of free-draining, gritty 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 decaryi need?

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

Should you water euphorbia decaryi after repotting?

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

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