Gardeners can suppress weeds by laying cardboard boxes on the soil, a method that blocks sunlight and enriches the ground as it decomposes, according to a horticultural expert.
Simple cardboard technique
Chris Bonnett, founder of GardeningExpress, recommends using leftover cardboard as an eco-friendly alternative to chemical weed killers. The cardboard blocks sunlight, which weeds need to grow, and naturally breaks down over time.
To apply, cut cardboard to size and remove any plastic tape or stickers, as these do not biodegrade. Place the cardboard flat over the problem area, pressing it down firmly to eliminate gaps. If using smaller pieces, overlap them by about 15cm to prevent weeds from creeping through edges.
Benefits for soil
Cover the cardboard with a layer of mulch or compost to keep it in place, improve appearance, and retain soil moisture. The cardboard will decompose over several months, adding organic matter and creating a healthier growing environment.
Bonnett warns that chemical alternatives can cause "problems" for the wider garden, making this cardboard method a safer choice for persistent weed issues.
