Using outdoor soil or garden compost for houseplants is not recommended and often leads to poor results. Garden soil is formulated for outdoor growing conditions, not the drainage, aeration, and sterility requirements of pot-grown houseplants. It typically compacts heavily in pots, drains poorly, may harbour pests and pathogens, and does not provide the structure tropical houseplant roots need. A purpose-made houseplant compost or a mixed growing medium suited to the specific plant type will produce significantly better results.
Garden soil is also typically too dense for good root penetration. Houseplant roots grow through loose, porous compost with ease but cannot penetrate compacted mineral soil effectively, limiting the plant's ability to establish and grow.
Pest and Disease Risk
Outdoor soil contains a wide range of organisms: fungal pathogens, pest eggs and larvae, weed seeds, and soil-dwelling insects that are harmless or naturally regulated in outdoor conditions but can become serious problems in the enclosed environment of a pot. Fungus gnats, vine weevils, and soil-borne pathogens that cause root rot can all be introduced on garden soil. Bringing outdoor soil indoors also risks introducing pests to any existing houseplants in the home through compost contact or spore dispersal.
What to Use Instead
A good quality houseplant potting mix provides the balance of moisture retention, drainage, and aeration that most tropical houseplants need.
Through our knowledge of commercial growing, we've created a range of high-quality substrate mixes, perfectly designed for the home environment. All our substrates are peat-free, and made from the highest quality ingredients like Coco Husk, Pumice, Lava Rock, and more.
If you're more adventurous in your growing, or you like to create your own mix. We've selected the best soil components available on the market, ensuring you can buy everything needed to create substrates for any kind of indoor plant.
Can I Use Garden Compost Rather Than Garden Soil?
Well-made, fully mature garden compost (from a hot compost heap that has fully broken down over at least six months) is less problematic than raw garden soil but still not ideal for houseplants. The drainage properties are better than garden soil but still inferior to purpose-made peat or coir-based houseplant compost. The sterility is less assured: if the compost heap did not reach sufficient temperature throughout, weed seeds, fungal spores, and pest eggs may survive. For houseplants, purpose-made compost is the reliable choice.
Garden compost is best left for outdoor beds where its characteristics are well-suited.
Shop our full collection of repotting essentials here.