Repotting guide

When & how to repot White Stonecrop (Sedum album)

Also called Coral Carpet.

More about white stonecrop

About White Stonecrop

Sedum album · also called Coral Carpet · flowering

White Stonecrop is a low, spreading evergreen succulent with plump, cylindrical green leaves that flush coral-red in heat and cold, crowned by clouds of white summer flowers. A classic green-roof and rockery groundcover, it is exceptionally drought- and cold-hardy, roots from the smallest fragment, and is ASPCA non-toxic to cats and dogs.

Mature size: 5-15 cm tall (taller in flower), spreading 30-60 cm or more.

Watch for — Sparse, woody centre: Old colonies thin out. Shear back and replant rooted fragments to regenerate.

How to tell white stonecrop needs repotting

Repotting on a calendar is less reliable than reading the plant. For white stonecrop, 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 white stonecrop

Every 2–3 years, into bone-dry mix. White Stonecrop's growth habit — low, fast, evergreen carpeting mat; stems root readily at the nodes and knit into a dense weed-suppressing cover. — sets the pace. White Stonecrop is a low, spreading evergreen succulent with plump, cylindrical green leaves that flush coral-red in heat and cold, crowned by clouds of white summer flowers. A classic green-roof and rockery groundcover, it is exceptionally drought- and cold-hardy, roots from the smallest fragment, and is ASPCA non-toxic to cats and dogs.

What size pot to step white stonecrop up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. White Stonecrop 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 white stonecrop

Spring or summer, while white stonecrop 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 white stonecrop

Repot dry. Do not water white stonecrop 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 lean, gritty, sharply drained soil 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 white stonecrop 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 white stonecrop 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 white stonecrop

White Stonecrop wants lean, gritty, sharply drained soil. Excels in thin, rocky, sandy substrates, gravel and green-roof media. Standard succulent mix with extra grit indoors; rich or wet soil causes rot. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting white stonecrop — frequently asked questions

How often should you repot white stonecrop?

Every 2–3 years, into bone-dry mix for white stonecrop. Repot white stonecrop every 2–3 years into a snug pot of lean, gritty, sharply drained soil, 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 white stonecrop need?

When is the best time of year to repot white stonecrop?

Should you water white stonecrop after repotting?

No — not straight away. Repot white stonecrop 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 white stonecrop after repotting?

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