Potting Mix Recipes for Every Plant
Almost every specialty potting mix on the shelf is a markup on the same handful of ingredients. With a bag of quality potting mix, a bag of perlite, and a bag of orchid bark, you can build a better version of nearly all of them. Here are the ratios, by parts, where a part is any scoop you like.
The core ingredients
- Potting mix (peat or coir based): the moisture-holding backbone. Buy indoor potting mix, never "garden soil" or "topsoil," which compact into brick indoors.
- Perlite: the white volcanic popcorn. Creates air pockets and drainage. The single most useful upgrade to any bagged mix.
- Orchid bark (fir bark): chunky structure that roots grip and air flows through. Essential for aroids and orchids.
- Optional upgrades: worm castings for gentle nutrition (a 10 percent addition to anything), horticultural charcoal for freshness in dense mixes, coarse sand or grit for weight in succulent mixes.
The recipes
| Mix | Recipe (by parts) | For |
|---|---|---|
| All-purpose upgrade | 3 potting mix + 1 perlite | Pothos, philodendron, peperomia, most common houseplants |
| Aroid chunky mix | 2 potting mix + 1 perlite + 1 bark (+ handful of charcoal) | Monstera, larger philodendron, anthurium, hoya |
| Succulent and cactus | 1 potting mix + 1 perlite + 1 coarse sand or grit | Succulents, cacti, snake plants, ponytail palm |
| Fern and moisture lover | 3 potting mix + 1 perlite + handful of worm castings | Ferns, calathea, peace lily |
| Orchid | 4 bark + 1 perlite (+ optional handful of sphagnum) | Phalaenopsis and most epiphytic orchids; no soil at all |
| Seed starting | 2 coir or fine potting mix + 1 perlite, sifted | Seeds and delicate cuttings; low nutrition is correct here |
| Bonsai (beginner) | 1 bark + 1 grit or pumice + 1 potting mix | Nursery-stock bonsai in training; see our bonsai soil guide for the full picture |
Why drainage beats nutrition
New growers obsess over fertilizer; experienced growers obsess over air. Roots need oxygen as much as water, and a dense, soggy mix suffocates them long before nutrition becomes the limiting factor. When in doubt, add perlite. It is nearly impossible to overdo for houseplants, and it is why our recipes lean airier than bagged defaults. Pair the right mix with the right pot: our drainage explainer and size guide complete the triangle.
Mixing and storing
- Mix in a bucket or tote, moistening slightly as you go; bone-dry peat repels water the first time.
- Make double what today's repot needs. Sealed in a tote, mix keeps for months.
- Reusing old soil is fine for the compost or outdoor beds, risky for pots: it carries whatever pests and pathogens the last resident had, and its structure has usually collapsed.
Budget note
The three base bags run $25 to $40 total at a local nursery or garden center and will repot an entire shelf of plants; the equivalent volume of pre-labeled specialty mixes costs two to three times that. Prices and quantities are in the cost guide, and the calculator tells you how many quarts your next repot actually needs.
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