Old sponges, don't throw them away: "they're worth gold" I always use them like this in the garden

Combine garden soil with cut pieces of sponge.
Add sand in a proportion of 1 share of sand for 3 parts soil-sponge mixing.
Homogeneous mixture:
Mix well to ensure uniform distribution of sand, sponge and soil.
Make sure that the sand is properly incorporated to maximise its beneficial effects on soil aeration.
By following these practical tips, you create an optimal environment for the growth of your plants, while taking an ecological and sustainable approach.

The 3 Mistakes to Avoid When Using Sponge
Use synthetic sponges that are not biodegradable: Synthetic sponges are often made from non-biodegradable materials, such as plastic, that can pollute the environment when they decompose. Using biodegradable sponges is essential to minimise environmental impact, as they decompose naturally and leave no harmful residues.
Do not disinfect sponges before using them: Cooking sponges, especially those used, may contain bacteria and other microbes. It is crucial to wash well and disinfect the sponges before using them in the garden. This can be done by soaking them in vinegar or sodium bicarbonate for 24 hours, or by using a solution of bleach for more severe disinfection. A clean sponge ensures that you do not introduce pathogens into your soil, thereby protecting the health of your plants.
Use already degraded or over-used sponges: Sponges that are too worn or degraded are no longer effective at retaining moisture, one of the main reasons for using them in gardening. In addition, highly degraded sponges can rapidly disintegrate into the soil, reducing their ability to ventilate the soil and protect plant roots. It is therefore preferable to use sponges that are still in good condition to ensure their effectiveness in the garden.
The 2 Golden Rules for Successful Gardening
Always use clean and disinfected sponges: Before you integrate your used sponges into the garden, it is essential to make sure that they are perfectly clean and disinfected. This removes any trace of bacteria, moulds or other contaminants that could harm your plants. To do this, wash the sponges with hot water and disinfect them by soaking them in vinegar or sodium bicarbonate for 24 hours. You can also use a bleach solution, but prefer milder disinfectants for the environment if possible.
Make sure the soil-sponge mixture is homogeneous: To fully enjoy the benefits of sponges in gardening, it is crucial to mix the sponge pieces well with the soil. A homogeneous mixture ensures that the sponges are evenly distributed, allowing better moisture retention and optimal soil ventilation. It also facilitates root growth by providing a stable and well-structured environment. For a better result, carefully mix the pieces of sponge with the soil in a bag or container before using it in your garden pots or beds.
1 tip for better soil ventilation
Add sand to the earth-sponge mixture to further improve ventilation and allow better growth of roots: