Soil & potting mix
Best soil for 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.
Preferred mix: Free-draining cactus mix with 40-50% coarse grit
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.
Why compton's living stone needs this mix
Compton's Living Stone is a desert plant — its mix should be roughly three-quarters mineral grit, behaving more like wet gravel than soil.
- Compton's Living Stone stores its own water in its tissue, so the mix must drain in seconds and then dry hard — the plant supplies the reservoir, not the soil.
- Desert roots breathe through the same large pores that let water escape; pack them in dense compost and they suffocate before they rot.
- A gritty, low-organic mix also stays lean, which keeps growth tight and the plant true to its compact wild form.
For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.
What goes wrong with the wrong mix
The wrong soil is one of the most common reasons compton's living stone struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- Ordinary peat-based potting compost holds many times its weight in water and stays wet for weeks — for compton's living stone that is a slow root-rot sentence.
- Moisture-retaining "houseplant" mixes with added water crystals are the single worst choice you can make for a desert species.
- Even a "cactus" bag from a supermarket is often too peaty; it almost always needs cutting hard with extra grit or pumice.
Potting compton's living stone in the bag straight off the shelf without adding 50% or more mineral grit. The wrong mix kills more desert plants than any watering error.
pH — does it matter for compton's living stone?
Compton's Living Stone is relaxed about pH — a slightly acidic to neutral mix (around 6.0-7.0) is fine. Drainage, not pH, is the variable that decides whether it lives.
If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.
DIY mix vs a bagged one
Bagged cactus compost is a starting point, not a finished mix — cut it at least 1:1 with pumice or grit. Mixing your own from the ratio above is cheaper and far more reliable for compton's living stone.
Drainage and the pot
A terracotta pot with a generous drainage hole is ideal — it wicks moisture out through the walls and dries the rootball from every side. Never use a pot without a hole, and never let the pot stand in a saucer of water.
A gritty mineral mix barely breaks down, so compton's living stone only needs repotting every 3-4 years, usually just to refresh grit and move up a pot size. When the time comes, our repotting guide for compton's living stone covers the timing and technique step by step.
Compton's Living Stone soil — frequently asked questions
What is the best soil mix for compton's living stone?
2 parts pumice or coarse perlite : 1 part coarse horticultural grit or coarse sand : 1 part low-peat cactus compost. Compton's Living Stone stores its own water in its tissue, so the mix must drain in seconds and then dry hard — the plant supplies the reservoir, not the soil.
Can I use normal potting soil for compton's living stone?
Ordinary peat-based potting compost holds many times its weight in water and stays wet for weeks — for compton's living stone that is a slow root-rot sentence. Bagged cactus compost is a starting point, not a finished mix — cut it at least 1:1 with pumice or grit. Mixing your own from the ratio above is cheaper and far more reliable for compton's living stone.
Does compton's living stone need a special pH?
Compton's Living Stone is relaxed about pH — a slightly acidic to neutral mix (around 6.0-7.0) is fine. Drainage, not pH, is the variable that decides whether it lives.
Should I buy a bagged mix or make my own for compton's living stone?
Bagged cactus compost is a starting point, not a finished mix — cut it at least 1:1 with pumice or grit. Mixing your own from the ratio above is cheaper and far more reliable for compton's living stone.
How often should I refresh the soil for compton's living stone?
A gritty mineral mix barely breaks down, so compton's living stone only needs repotting every 3-4 years, usually just to refresh grit and move up a pot size. A terracotta pot with a generous drainage hole is ideal — it wicks moisture out through the walls and dries the rootball from every side. Never use a pot without a hole, and never let the pot stand in a saucer of water.
Keep reading
- Compton's Living Stone care — the full brief (light, water, humidity, problems, pet safety)
- How often to water compton's living stone — the schedule the mix feeds into
- Repotting compton's living stone — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- How often to water succulents — the soak-and-dry method
- Why is my succulent dying? The overwatering autopsy
- Root rot — how the wrong soil starts it, and how to save the plant
- Best soil for philodendron radiatum
- Best soil for philodendron tripartitum
- Best soil for philodendron panduriforme
- All 11687 soil and potting-mix guides in the Growli library