Gardeners are being encouraged to put plain cardboard outside as a covering across the soil before the end of November, using it as a temporary weed-suppressing barrier instead of sending it to recycling.
Why cardboard works against weeds
The plant experts at GardeningExpress.co.uk said cardboard proves ideal for weed suppression as it blocks sunlight, which weakens their growth over time. Cardboard is biodegradable once stickers and plastic tape are removed, making it harder for weeds to flourish. Without adequate light, many existing weeds will find it hard to survive, while the covering can also help stop weed seeds from sprouting.
It is worth noting that should it rain, the cardboard may require replacement. It can also prevent water and nutrients from reaching other plants, so it is crucial that it be employed solely to suppress weeds.
How to lay the cardboard
The plant experts said: "Lay the cardboard flat on the ground, ensuring it completely covers the affected area and is pressed down securely to prevent any gaps.
"If smaller pieces of cardboard are all that are at hand, overlap them by around 15cm to stop weeds creeping through the edges to reach the sunlight."
Once the cardboard is in place, cover it with a layer of mulch or compost. This helps hold the cardboard down as well as improving its appearance and retaining moisture in the soil, allowing the cardboard to break down naturally.
According to the experts, after a few months, the cardboard will also begin to decompose, benefiting the soil as "brown" matter and helping create a healthier growing environment for the rest of the garden.
