Winter may seem like a quiet time for gardening, but there is a simple, affordable material within anyone’s reach that can transform outdoor work. Cardboard, in addition to being ecological, helps suppress weeds in the garden, improves soil quality and prepares beds for spring with minimal effort.
Why cardboard is so effective in the garden
According to the Portuguese weather portal Tempo, the use of simple brown cardboard, without coatings, is an effective method to prevent the development of weeds. By blocking sunlight, it prevents germination and reduces the appearance of new seedlings. As it decomposes, the cardboard adds organic carbon to the soil, improving its structure and supporting beneficial organisms such as earthworms and microbes.
This process works as a natural alternative to herbicides, contributing to healthier and more balanced soil over time. It’s a sustainable and affordable solution, especially useful during the colder months.
Useful support in areas with excess water
During winter, some areas experience greater water accumulation. In these cases, the card can be integrated into rain gardens, small garden depressions that collect excess water. Combined with wild or marsh plants, it helps control runoff, retains moisture and filters pollutants naturally.
Plants such as holly, hawthorn or creeping thyme complement the cardboard’s action, stabilizing the soil and improving infiltration. This is a simple method that can be easily adapted to residential spaces.
How to apply cardboard in the garden during winter
The first step is to select clean, brown cardboard boxes without shiny coatings, which may contain unwanted chemicals. Before application, it is important to remove tape, staples or labels. The sheets must be placed overlapping each other to prevent openings where weeds can grow. In more affected areas, a second layer may be necessary.
Moistening the cardboard helps it adjust to the soil and speeds up the decomposition process. Those who want to plant directly through this layer can make small X-shaped cuts. Applying compost or mulch on top improves the appearance, fixes the cardboard and provides additional nutrients.
Simple maintenance throughout the winter
Maintenance requires only occasional checks, according to . If weeds appear near the cuts, simply remove them and replace the mulch when necessary. Over time, the cardboard decomposes naturally and integrates into the soil, leaving it more fertile in spring.
It is important to avoid too thick layers, which can temporarily reduce soil aeration. On wet days, exposed cardboard may attract slugs or small rodents, so top covering is essential.
An economical, ecological and effective method
In addition to being practically free, this method reduces the need for chemical products, retains moisture, improves soil structure and facilitates the work of preparing the beds. For those looking for simple and sustainable solutions during the winter, cardboard proves to be a surprisingly efficient resource.
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