Garden Soil, Topsoil, Compost, and Potting Mix Explained
A trip to the garden centre can leave you facing a wall of bags with names that sound alike. Choosing the wrong one can hurt your plants or waste your money. Here is a plain-language guide.
Topsoil
Topsoil is the upper layer of soil, usually used to fill, level, or build up a bed. Quality varies widely. It may be sandy, clayey, or full of stones, so look at it before you buy in bulk. It is good for filling holes and raising low areas, but on its own it is not always ideal for growing.
Compost
Compost is decomposed organic matter that improves soil structure and adds nutrients. It is not a complete growing medium on its own, but you can mix it into topsoil or beds. Look for compost that is dark and crumbly with a pleasant, earthy smell.
Garden soil
Bagged garden soil is often a blend of topsoil and compost, designed for use in in-ground beds or mixed with native soil. Check the label for its intended use. Some are not suitable for raised beds or containers without further additions.
Potting mix
Potting mix, also called potting soil or container mix, is a light, soilless blend, often with peat or coir, bark, perlite, and sometimes fertilizer. It drains well and is meant for containers. Do not use garden soil in pots, as it can compact and drain poorly.
Raised bed mix
A common approach is to blend topsoil and compost, about half and half, and sometimes to add materials such as coarse sand or perlite for drainage. Some suppliers sell ready-made raised bed blends.
Buying tips
- Read the label carefully for the intended use.
- For large areas, ask suppliers about bulk deliveries, which are often cheaper per volume.
- Check for weeds, stones, and a strong chemical smell.
- Store bags off the ground in the shade to keep them in good shape.
Match the product to the job, and your plants will thank you.