Characteristics of Succulent Soil
The natural soils they choose are saturated by heavy rains but dry out quickly. Succulents adapt to harsh, even extreme conditions and extremely poor soils. This dictates the special requirements for the potting mix composition.
It is important that the soil:
- contains a low amount of organic matter;
- does not have high levels of nitrogen and its compounds, which can be detrimental to the succulent;
- is loose, lightweight, and highly aerated;
- does not retain or accumulate moisture (excess water must drain easily);
- is neutral or slightly acidic (pH 5.5 – 7.0);
- is not prone to compaction or clogging.
Optimal Composition
A potting mix for cacti and succulents should contain:
Potting Soil (Organic Base). Standard indoor potting mix, garden loam, or leaf mold will work. Its share in the finished mix should range from 40% to 60%. This component is used as a source of minerals and nutrients.
Inorganic Amendments (Aeration Materials). These are required to improve aeration and drainage. Pumice, perlite, coarse sand, poultry grit, zeolite, gravel, or expanded clay pebbles (LECA) are suitable options. They should make up 30-50% of the total mass.
Crushed Horticultural Charcoal. This natural antiseptic prevents the development of pathological processes. It blocks fungal activity and prevents root rot. This component also improves air exchange. It accounts for about 10% of the total mass.
The mix is traditionally laid out in 3 layers. A drainage layer at the bottom, then the main potting mix, and a top dressing (drainage/grit layer) at the top of the pot.
What to Look for When Choosing a Store-Bought Mix
When choosing a pre-made potting mix, consider several nuances:
- Packaging Information. Buy only those soils labeled “Cactus and Succulent Mix.” Other options are not suitable for plants accustomed to harsh environmental conditions.
- Composition. The base should consist of standard peat or coco coir. Be careful with pure sphagnum peat moss, as it retains moisture for a long time, and once fully dry, it becomes hydrophobic and hard to re-wet. Give preference to products labeled “Enriched” or containing added fertilizers. Such mixtures contain compost or earthworm castings.
In addition, the mix must necessarily include inorganic amendments (perlite, coarse sand, or pumice), dolomite lime (to balance acidity), a soil base (potting soil or leaf mold), and horticultural charcoal (a natural antiseptic).
Making Your Own Potting Mix
Mix thoroughly to achieve a homogeneous blend. Ensure that the resulting mass is free of debris, small twigs, and other unwanted materials.
Pour a layer of pumice, perlite, or gravel at the bottom of the pot. The container must have drainage holes at the bottom to allow excess liquid to escape. It’s best to use terracotta (clay) pots, as the natural porous material allows better airflow to the succulent’s roots. You can also use crushed terracotta, pebbles, or crushed stone as a drainage layer.
Preparing and Sterilizing the Soil Before Planting
Store-bought commercial potting mixes are usually already pre-treated and sterilized. However, if you decide to make the potting soil with your own hands (or reuse old soil), you will have to sanitize it at home. You can do this in several ways:
- Baking in the oven. Moisten the soil slightly, spread it in an oven-safe pan, cover loosely with foil, and preheat the oven to 180-200°F (82-93°C). Bake the container with the soil for about 30-45 minutes.
- Microwaving. Place moist (not soaking wet) soil in a microwave-safe container with ventilation holes. Microwave on high power for about 90 seconds per pound of soil.
- Steaming. Steam the soil over a water bath. The duration of the procedure is 30-45 minutes.
Drainage materials (like pebbles or LECA) also need to be treated before reuse. First, wash them thoroughly, then soak them in a 3% hydrogen peroxide solution or diluted rubbing alcohol for a few hours, rinse, and dry.
Best Commercial Potting Mixes
Products from the following manufacturers have received excellent reviews (such as Miracle-Gro, Hoffman, or Superfly Bonsai):
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Frequently Asked Questions
Experienced growers almost always prefer to make their own succulent mix. This ensures full confidence in the quality and exact proportions of each ingredient. However, if you're just getting started, a store-bought cactus and succulent mix (such as Hoffman or Bonsai Jack) is a perfectly reliable option that saves time and reduces the risk of mistakes. Many experienced growers even use a 50/50 combination: half commercial cactus mix and half perlite or pumice, which is one of the most popular "quick recipes" in the US succulent community.
Take a small amount of the mix in your hand and squeeze it tightly. When you open your hand, the mix should fall apart and remain loose and crumbly. If it holds together in a dense clump, the soil is retaining too much moisture — add more coarse perlite, pumice, or horticultural grit to improve drainage.
You can — but only if you amend it significantly. Standard all-purpose mixes (like Miracle-Gro All Purpose) contain too much peat or coco coir and retain far too much moisture for succulents, which can quickly lead to root rot. If you only have all-purpose potting mix on hand, combine it with at least 50% inorganic material — coarse perlite, pumice, or poultry grit — before planting. Never use it straight out of the bag for succulents.
Pumice is widely considered the gold standard by serious succulent growers in the US. Unlike perlite, it doesn't float to the surface when watered and doesn't degrade over time. It's readily available at most garden centers or online (Amazon, Bonsai Jack). Perlite is a close second and is more budget-friendly and easy to find. Coarse poultry grit (sold at farm supply stores like Tractor Supply Co.) is another popular and affordable option that works excellently as an amendment.
Most succulents benefit from repotting every 1–2 years, or when you notice roots growing out of the drainage holes. Spring is the ideal time to repot, at the start of the active growing season. If you're using a purely mineral substrate like Akadama, a full soil replacement is recommended every 12 months, as the granules break down over time and lose their drainage properties.
Yes, it matters. Most succulents thrive in a slightly acidic to neutral soil with a pH between 6.0 and 7.0. Soils that are too acidic (below 5.5) or too alkaline (above 7.5) can prevent the plant from absorbing nutrients properly, even if those nutrients are present in the soil. You can check pH with an inexpensive soil pH meter (available at Home Depot, Lowe's, or on Amazon for $10–$20) or with disposable pH test strips. To raise pH (make less acidic), add agricultural lime; to lower it, add sulfur or use peat-based amendments.
Succulents are light feeders and do not need heavy fertilization. During the active growing season (spring through early fall), you can apply a diluted balanced liquid fertilizer — at half the recommended strength — once a month. A slow-release granular fertilizer like Osmocote (mixed directly into the potting soil) is another convenient and popular option in the US. Avoid fertilizing entirely during winter dormancy, as the plant's metabolism slows down and excess nutrients can damage the roots.
