Cacti and succulents rot in ordinary potting soil. They evolved in fast-draining, gritty ground and store their own water, so they need a mix that drains almost immediately and dries quickly — the opposite of the moisture-holding mix most houseplants like. Get the soil right and succulents are nearly indestructible; get it wrong and they collapse from root rot. This guide covers cactus mixes, what makes them work, and how to build your own.
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Quick recommendations
- Best ready-made: a gritty cactus & succulent mix
- Best DIY grit: pumice or coarse perlite to sharpen any mix
- Best inorganic option: a high-mineral (pumice/grit) blend for rot-prone plants
- Best top-dressing: decorative grit to finish and protect the crown
How we chose
The single most important trait is fast drainage and low water retention. We favour gritty, mineral-rich mixes; the more rot-prone the plant (or the wetter your climate), the grittier it should be.
Recommended options
Ready-made cactus & succulent mix
The simplest correct choice — pre-blended to drain fast. Many benefit from extra grit added, especially in humid climates.
Pumice
Lightweight mineral grit that adds drainage and air and doesn’t break down — the ideal succulent amendment (or even a mostly-pumice medium).
Perlite & coarse grit
Cheaper aeration; blend into a general mix to make it succulent-friendly.
Grit top-dressing
A layer of grit keeps the stem/crown dry, deters gnats and finishes the pot.
A simple succulent mix
| Situation | Suggested blend |
|---|---|
| Most succulents | About half potting mix, half grit/pumice |
| Rot-prone / humid climate | More grit/pumice, less organic matter |
| Desert cacti | Very gritty, minimal organic content |
How to choose
- Buy a cactus mix and, unless you’re in a dry climate, add extra pumice or grit — most bagged mixes still hold a bit too much water.
- Wetter climate or over-waterer? Go grittier (even mostly mineral).
- Always use pots with drainage holes — no mix saves a succulent in a sealed pot.
Common mistakes
- Using regular potting soil — it stays wet and rots roots.
- Decorative pots with no drainage hole.
- Not adding grit to a bagged “cactus” mix that’s still too rich.
- Watering on a schedule instead of only when the mix is fully dry.
FAQ
Can I use normal potting soil for succulents? No — it holds too much water and causes rot. Use a gritty cactus mix, ideally with extra pumice.
How do I make my own succulent soil? Blend roughly half potting mix with half pumice or coarse grit; use more grit for rot-prone plants or humid climates.
Is perlite or pumice better? Both aerate; pumice is heavier (more stable) and longer-lasting, perlite is cheaper and lighter.
Why did my succulent rot? Almost always soil that held too much water, a pot without drainage, or watering before the mix dried out.
Final recommendation
Grow cacti and succulents in a gritty cactus mix sharpened with pumice or coarse grit — grittier the wetter your climate — in a pot with drainage, topped with grit. Then water only when the mix is completely dry, and succulents practically look after themselves.
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See also: best potting soil · all soil & growing media.