Repotting guide

When & how to repot Laza Cyphostemma (Cyphostemma laza)

Also called Laza Cyphostemma, Laza Grape, Laza Tree.

More about laza cyphostemma

About Laza Cyphostemma

Cyphostemma laza · also called Laza Cyphostemma, Laza Grape · tropical

A spectacular caudiciform vine endemic to the arid rocky hills of Madagascar, prized for its massive swollen caudex that can exceed 500 mm across and vining stems that extend several metres. Bright, direct sun and generous summer water with a completely dry winter rest are essential. A slow-growing collector's plant of great ornamental drama.

Mature size: Caudex up to 500 mm (20 in) wide and 1.5 m (5 ft) tall; vining stems to 5 m (16 ft) long in ideal conditions

How to tell laza cyphostemma needs repotting

Repotting on a calendar is less reliable than reading the plant. For laza cyphostemma, 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 laza cyphostemma

Every 2–3 years, into bone-dry mix. Laza Cyphostemma's growth habit — deciduous caudiciform vine with a massive swollen caudex and long vining stems that sprawl or climb — sets the pace. A spectacular caudiciform vine endemic to the arid rocky hills of Madagascar, prized for its massive swollen caudex that can exceed 500 mm across and vining stems that extend several metres. Bright, direct sun and generous summer water with a completely dry winter rest are essential. A slow-growing collector's plant of great ornamental drama.

What size pot to step laza cyphostemma up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Laza Cyphostemma 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 laza cyphostemma

Spring or summer, while laza cyphostemma 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 laza cyphostemma

Repot dry. Do not water laza cyphostemma 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 sandy, fast-draining cactus or 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 laza cyphostemma 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 laza cyphostemma 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 laza cyphostemma

Laza Cyphostemma wants sandy, fast-draining cactus or succulent mix. A blend of coarse sand, pumice, and a small proportion of loam or cactus compost works well. The key requirement is that the mix drains instantly and does not retain moisture around the base of the caudex. Repot only every 2–3 years as growth is slow. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting laza cyphostemma — frequently asked questions

How often should you repot laza cyphostemma?

Every 2–3 years, into bone-dry mix for laza cyphostemma. Repot laza cyphostemma every 2–3 years into a snug pot of sandy, fast-draining cactus or 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 laza cyphostemma need?

When is the best time of year to repot laza cyphostemma?

Should you water laza cyphostemma after repotting?

No — not straight away. Repot laza cyphostemma 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 laza cyphostemma after repotting?

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