Make your own potting compost: a greener alternative to bought compost

Every spring, many amateur gardeners carry heavy bags home – even though there is an easier, cheaper and far greener alternative.

Faced with long pallets of potting compost at the garden centre, it is easy to reach for a bag without thinking. Neatly packaged and convenient, “all-purpose compost” promises quick results in beds and on balconies. However, this convenient purchase carries a cost far beyond the amount paid at the till – affecting the climate, the environment and even the quality of your own soil. For this reason, an increasing number of experienced gardeners are switching entirely to homemade compost mixes.

Why bought potting compost is so problematic

Most commercially available composts still contain a large proportion of peat. Peat comes from bogs: highly sensitive ecosystems that have developed over thousands of years. These bogs are enormous carbon stores. When peat is extracted, the land dries out and the carbon it holds is released into the atmosphere.

“Every bag of peat compost adds a little more to the greenhouse effect – often without people realising it.”

Transport is another issue. Potting compost is often moved hundreds of kilometres, sometimes across Europe. Lorry journeys, storage and processing all create emissions. In the end, the compost comes in a thick plastic bag which, in many cases, is not recycled and remains as waste for a long time.

Avoiding these products reduces your personal carbon footprint and protects habitats that recover only very slowly. Once bog landscapes have been destroyed, they are virtually impossible to “repair”.

Mixing your own potting compost: easier than many people think

The alternative is to make your own potting compost. Although it may sound like more work, it is actually very straightforward. The method essentially relies on two components: compost and structural material. Both are already produced in everyday life, in the garden as well as the kitchen.

Compost as the nutrient powerhouse

Valuable materials are thrown away as food waste every day: vegetable and fruit scraps, coffee grounds, eggshells, wilted leaves and tea bags. They are wasted in the food-waste bin, but in your own compost heap they become nutrient-rich gold for the soil.

Mature compost provides plants with nitrogen, phosphorus, potassium and numerous trace elements. It improves soil structure, supports soil life and helps retain water. It serves as the “base ingredient” for good potting compost.

Structure for air and loose root space

Compost on its own is generally too heavy and compact. Homemade compost mixes need airy materials as well, so roots can breathe and water does not sit around them. This is where dry materials are useful:

• dried, shredded leaves