Repotting guide

When & how to repot Silver Crown (Cotyledon undulata)

Also called Silver Crown, Silver Ruffles.

More about silver crown

About Silver Crown

Cotyledon undulata · also called Silver Crown, Silver Ruffles · houseplant

A striking South African succulent shrub prized for its fan-shaped, heavily silver-white powdered (farinose) leaves with wavy, undulating margins. Native to the Western Cape. Winter grower that flowers in summer with pendulous orange-red tubular blooms. Best in bright light with excellent drainage; avoid wetting the powdery leaf coating.

Mature size: 30–60 cm tall; 30–45 cm wide

Watch for — Root rot from overwatering: Cotyledon undulata is highly susceptible to root rot if soil stays moist, particularly in cool or low-light conditions. Use gritty, fast-draining mix and allow thorough drying between waterings. Brown, mushy stem base indicates rot — remove and re-root healthy cuttings.

How to tell silver crown needs repotting

Repotting on a calendar is less reliable than reading the plant. For silver crown, 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 silver crown

Every 2–3 years, into bone-dry mix. Silver Crown's growth habit — upright to spreading shrubby succulent with thick fan-shaped leaves on woody stems; may branch with age — sets the pace. A striking South African succulent shrub prized for its fan-shaped, heavily silver-white powdered (farinose) leaves with wavy, undulating margins. Native to the Western Cape. Winter grower that flowers in summer with pendulous orange-red tubular blooms. Best in bright light with excellent drainage; avoid wetting the powdery leaf coating.

What size pot to step silver crown up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Silver Crown 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 silver crown

Spring or summer, while silver crown 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 silver crown

Repot dry. Do not water silver crown 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 well-draining succulent/cactus 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 silver crown 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 silver crown 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 silver crown

Silver Crown wants well-draining succulent/cactus mix. Use a commercial cactus compost blended with 30–40% coarse grit or perlite to ensure rapid drainage. Avoid peat-heavy mixes that retain moisture. Slightly acidic to neutral pH (6.0–7.0). Repot every 2–3 years in spring. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting silver crown — frequently asked questions

How often should you repot silver crown?

Every 2–3 years, into bone-dry mix for silver crown. Repot silver crown every 2–3 years into a snug pot of well-draining succulent/cactus 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 silver crown need?

When is the best time of year to repot silver crown?

Should you water silver crown after repotting?

No — not straight away. Repot silver crown 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 silver crown after repotting?

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