Weeds can be a persistent nuisance in gardens, particularly during summer when warm temperatures and rainfall create ideal conditions for growth and seed germination. Common weeds like dandelions, daisies, bindweed, and ground elder are easily identifiable by their distinctive leaves and flowers, making them hard to ignore.
For those who prefer to avoid chemical weed killers, natural remedies such as white vinegar, baking soda, salt, and hot water are often recommended. However, these methods do not address the more labor-intensive aspects of weed removal, such as pulling and spraying.
A Hands-Free Solution: Sheet Mulching
Gardening expert Elizabeth Florio of Garden & Gun has introduced a hands-free approach known as "sheet mulching." While professional landscapers have used this technique for years, it is a "revelation" for home gardeners seeking to maintain tidy beds and borders without constant effort.
Florio explains: "It turns out the cardboard that passes through households in abundance is a low-fuss, good-for-the-soil, sustainable-many-times-over weed barrier."
The method is straightforward: place a flattened cardboard box over clusters of weeds and cover it with garden mulch. According to the expert, this works by "smothering the undergrowth" while simultaneously enriching the soil with carbon.
This technique is particularly appealing to gardeners who favour a no-dig approach to weed management. Many have already found it effective, as evidenced by a gardening enthusiast on the Charles Dowding forum who described cardboard as an "amazing" solution for suppressing all types of garden weeds.
The forum member shared: "Under hedges I put cardboard with wood chip on top, nothing through at all. We also had a weed-ridden border which I put cardboard first, then planted heather into holes cut in it, then put peat compost all over as mulch and it is doing well, heather alive and had to pull about two weeds in two months."
How to Eliminate Weeds with Cardboard
There is no need to remove existing weeds before placing cardboard on top. In fact, many Charles Dowding forum members advise against it, as doing so can encourage more weeds to sprout. Instead, they recommend cutting them down and, if desired, allowing the top layers to flatten them.
Certain types of cardboard work best in the garden. Gardeners should choose plain brown cardboard with minimal ink and avoid glossy materials, which may contain plastic film or wax. Similarly, pieces with tape should be avoided, making pizza boxes a typically safe option.
Elizabeth recommends layering flattened boxes for maximum protection against weeds. Spraying them with water is also advised to ensure the cardboard moulds to the ground and stays in place. If planting new plants on top of the cardboard, a layer of compost and planting soil is required. Simply spread mulch—such as wood chips, pine straw, or other organic materials—directly onto the cardboard.
