Soil & potting mix
Best soil for Pachyphytum werdermannii (Pachyphytum werdermannii)
Also called Werdermann's moonstones.
More about pachyphytum werdermannii
About Pachyphytum werdermannii
Pachyphytum werdermannii · also called Werdermann's moonstones · houseplant
Pachyphytum werdermannii, Werdermann's moonstones, is a Mexican succulent with large, plump, rounded blue-grey leaves heavily veiled in chalky white farina, often flushing lilac-pink in strong light. It forms a loose rosette that trails with age. A classic desert succulent, it needs bright sun, very gritty soil, and sparing soak-and-dry watering.
Preferred mix: Mineral-rich, sharply draining succulent mix
Watch for — Rot from overwatering: The very plump leaves rot fast in moist soil. Watch for mushy, translucent leaves and let the gritty mix dry out completely between waterings.
Why pachyphytum werdermannii needs this mix
Pachyphytum werdermannii stores water in its leaves and stems, so it wants a free-draining, gritty mix that dries out fully between waterings — not a moisture-holding one.
- Pachyphytum werdermannii carries its own water supply in its thick tissue, so the soil's job is to drain fast and then get out of the way.
- Its roots are adapted to short wet spells followed by long dry ones — a mix that stays damp removes the dry phase they depend on.
- A gritty mix also keeps the plant compact and well-coloured rather than soft, leggy and prone to collapse.
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 pachyphytum werdermannii struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- Standard potting compost on its own stays wet far too long for pachyphytum werdermannii; the lower leaves and stem base go soft and translucent first.
- Big plastic pots full of dense mix hold a wet core long after the surface looks dry — that hidden wet zone is where rot starts.
- Anything sold as "moisture control" is the opposite of what this plant wants.
Treating pachyphytum werdermannii like a leafy houseplant and using plain compost. It needs at least half its volume as grit, perlite or pumice to survive long term.
pH — does it matter for pachyphytum werdermannii?
pH is not a concern for pachyphytum werdermannii — anything from mildly acidic to neutral (6.0-7.0) works. Get the drainage right and pH looks after itself.
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
A good bagged "cactus and succulent" mix works for pachyphytum werdermannii if you add roughly 30-50% extra perlite or grit. Mixing your own from the ratio above gives you full control of how fast it dries.
Drainage and the pot
Use a pot with a drainage hole and empty the saucer within minutes of watering. Terracotta is more forgiving than glazed or plastic because it dries the rootball faster.
This mix decomposes slowly, so pachyphytum werdermannii only needs repotting every 2-3 years — mainly to refresh the grit and check the roots are firm and pale. When the time comes, our repotting guide for pachyphytum werdermannii covers the timing and technique step by step.
Pachyphytum werdermannii soil — frequently asked questions
What is the best soil mix for pachyphytum werdermannii?
2 parts standard cactus or succulent compost : 1 part perlite or pumice : 1 part coarse grit or coarse sand. Pachyphytum werdermannii carries its own water supply in its thick tissue, so the soil's job is to drain fast and then get out of the way.
Can I use normal potting soil for pachyphytum werdermannii?
Standard potting compost on its own stays wet far too long for pachyphytum werdermannii; the lower leaves and stem base go soft and translucent first. A good bagged "cactus and succulent" mix works for pachyphytum werdermannii if you add roughly 30-50% extra perlite or grit. Mixing your own from the ratio above gives you full control of how fast it dries.
Does pachyphytum werdermannii need a special pH?
pH is not a concern for pachyphytum werdermannii — anything from mildly acidic to neutral (6.0-7.0) works. Get the drainage right and pH looks after itself.
Should I buy a bagged mix or make my own for pachyphytum werdermannii?
A good bagged "cactus and succulent" mix works for pachyphytum werdermannii if you add roughly 30-50% extra perlite or grit. Mixing your own from the ratio above gives you full control of how fast it dries.
How often should I refresh the soil for pachyphytum werdermannii?
This mix decomposes slowly, so pachyphytum werdermannii only needs repotting every 2-3 years — mainly to refresh the grit and check the roots are firm and pale. Use a pot with a drainage hole and empty the saucer within minutes of watering. Terracotta is more forgiving than glazed or plastic because it dries the rootball faster.
Keep reading
- Pachyphytum werdermannii care — the full brief (light, water, humidity, problems, pet safety)
- How often to water pachyphytum werdermannii — the schedule the mix feeds into
- Repotting pachyphytum werdermannii — 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
- Overwatered plant — signs and recovery
- Root rot — how the wrong soil starts it, and how to save the plant
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- All 2464 soil and potting-mix guides in the Growli library