The Best Soil Mix for Succulents (and Why Shop Compost Fails)

The number one killer of succulents

It isn't underwatering. It isn't too much sun. The single most common reason succulents die is soil that holds too much moisture. Most standard potting compost is designed to retain water — brilliant for thirsty tropicals, deadly for succulents that evolved in arid, fast-draining environments.

What succulents actually need

In their natural habitat, succulents grow in rocky, sandy, mineral-rich soil that drains almost instantly after rain and dries out completely between waterings. Your potting mix needs to replicate this: fast drainage, low organic content, and good aeration around the roots.

The ideal succulent soil ratio

The most reliable mix used by experienced growers:

• 50% inorganic grit — coarse perlite, horticultural grit, pumice, or a combination
• 50% organic base — standard multipurpose compost or cactus compost

Some growers go even grittier (60–70% inorganic) for particularly rot-prone species like Lithops. For most common succulents — Echeveria, Sedum, Aloe — the 50/50 split is the sweet spot.

Best ingredients

Perlite is the easiest to find and the most affordable. It's lightweight, improves drainage dramatically, and prevents compaction. Use a coarse grade (3–6mm) rather than fine horticultural perlite.

Pumice is the premium option — it improves drainage and aeration even better than perlite, and doesn't float to the surface when you water. More expensive but worth it for prized plants.

Horticultural grit (sharp sand, not builder's sand) adds weight and mimics the mineral-rich soils succulents grow in naturally. Avoid fine play sand — it compacts and makes drainage worse.

What to avoid

• Peat-heavy composts — retain water and become hydrophobic when dry, making them hard to re-wet evenly
• Garden soil — too heavy, compacts badly in pots
• "Cactus compost" from supermarkets — often just standard compost with a small amount of grit; not gritty enough on its own

Fixing shop-bought compost

If you already have a bag of standard succulent or cactus compost, don't throw it away. Simply mix it 50/50 with coarse perlite and you'll have a perfectly suitable medium. This is the most cost-effective approach for most home growers.

The pot matters too

Even the best soil mix won't save a succulent in a pot without drainage holes. Always use a pot with at least one hole at the base, and empty the saucer 30 minutes after watering. Terracotta pots are ideal — they're porous and help the soil dry out faster.

Join the conversation

Got a succulent that's struggling despite good soil? Post a photo in the community forum and our members will help diagnose the problem. You can also browse the plant care tips section for more growing guides.