Repotting guide

When & how to repot Compton's Living Stone (Lithops comptonii)

Also called Compton's Pebble Plant, Living Stone, Mimicry Succulent.

More about compton's living stone

About Compton's Living Stone

Lithops comptonii · also called Compton's Pebble Plant, Living Stone · houseplant

Lithops comptonii is a South African mesemb succulent with distinctive pebble-mimicking leaf pairs, typically grey-green to brown with a detailed windowed surface pattern. Yellow flowers emerge in late summer. Like all Lithops, it requires strict seasonal watering aligned to its leaf-renewal cycle to thrive indoors. The ASPCA lists Lithops as non-toxic to pets.

Mature size: 2-4 cm tall; 2-3 cm wide per leaf pair

Watch for — Root loss over winter: Lithops can shed most of their roots in dormancy — this is normal. Fresh roots emerge with the new leaf pair in spring.

How to tell compton's living stone needs repotting

Repotting on a calendar is less reliable than reading the plant. For compton's living stone, 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 compton's living stone

Every 2–3 years, into bone-dry mix. Compton's Living Stone's growth habit — stemless solitary or clumping mesemb succulent — sets the pace. Lithops comptonii is a South African mesemb succulent with distinctive pebble-mimicking leaf pairs, typically grey-green to brown with a detailed windowed surface pattern. Yellow flowers emerge in late summer. Like all Lithops, it requires strict seasonal watering aligned to its leaf-renewal cycle to thrive indoors. The ASPCA lists Lithops as non-toxic to pets.

What size pot to step compton's living stone up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Compton's Living Stone 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 compton's living stone

Spring or summer, while compton's living stone 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 compton's living stone

Repot dry. Do not water compton's living stone 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 mix with 40-50% coarse grit 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 compton's living stone 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 compton's living stone 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 compton's living stone

Compton's Living Stone wants free-draining cactus mix with 40-50% coarse grit. A commercial cactus compost cut heavily with sharp grit or perlite is essential. Top-dress with fine gravel or aquarium grit. The mix must be almost entirely free of organic matter that retains moisture. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting compton's living stone — frequently asked questions

How often should you repot compton's living stone?

Every 2–3 years, into bone-dry mix for compton's living stone. Repot compton's living stone every 2–3 years into a snug pot of free-draining cactus mix with 40-50% coarse grit, 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 compton's living stone need?

When is the best time of year to repot compton's living stone?

Should you water compton's living stone after repotting?

No — not straight away. Repot compton's living stone 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 compton's living stone after repotting?

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