Trench composting is an ancient, low-effort method for enriching garden soil that requires no special equipment or ongoing maintenance. By burying compostable kitchen and garden waste in a trench near where you plan to grow crops, the organic matter decomposes slowly over months, improving soil structure and fertility for the next season.
This method is ideal for gardeners with limited space who cannot accommodate a traditional compost bin or heap. It is also more forgiving than conventional composting: while a mix of green (nitrogen-rich) and brown (carbon-rich) materials is beneficial, the ratios need not be precise. The waste can be buried in a trench as shallow as 60cm (2ft) deep, though covering with a tarpaulin may be necessary to deter animals.
Even proponents of no-dig gardening can adopt trench composting when undertaking tasks that already disturb the soil, such as redoing perennial beds or removing persistent weeds. When building raised beds, compostable material can simply be layered at the base before filling, avoiding any digging altogether.
