With periods of drought and water restrictions on the increase, it’s becoming essential to find solutions to optimise the use of water in the garden. What if there was a simple trick to making the soil in your garden more absorbent, reducing the need for watering while maintaining the health of your plants?
Why is biochar the ultimate trick for more absorbent soil?
Biochar is a type of charcoal produced by the pyrolysis of organic residues such as wood or nut shells, in a low-oxygen environment. Used for centuries by certain civilisations, biochar is now finding its way back into modern gardening thanks to its many advantages. One of the main advantages of biochar is its ability to improve soil water retention.
By adding biochar to the soil, its porosity is considerably increased, allowing it to retain water like a sponge. In effect, biochar acts like a reservoir, retaining water and nutrients and gradually releasing them over time. This feature is particularly useful in sandy soils that drain quickly or heavy soils that have difficulty retaining moisture.
How can you use biochar in your garden?
To reap the full benefits of biochar, it is important to incorporate it correctly into the soil. Here’s how:
Preparation of biochar
Biochar can be bought from specialist garden shops or made at home using pyrolysis techniques. If you decide to make your own biochar, make sure the material you use is free of chemicals or contaminants.
Biochar must be activated before use to be effective. To do this, mix it with compost or manure and leave it to stand for a few weeks. This enriches the biochar with essential nutrients before incorporating it into the soil.
Incorporation in soil
To improve the soil’s absorption capacity, mix around 10% biochar with the top soil to a depth of 10-20 cm. This proportion may vary depending on the type of soil and the specific needs of your plants. Mixing can be done by hand or with a spade or cultivator.
Maintenance and follow-up
Once the biochar has been incorporated, it is important to monitor the soil to adjust your plants’ water requirements. You’ll soon notice that the soil retains moisture better, reducing the frequency of watering. Combining this technique with a good mulch will maximise the beneficial effects on water retention and the overall health of the soil.
The other benefits of biochar for the soil and plants
As well as its ability to improve water retention, biochar has many other benefits for the garden. It helps to improve soil structure, promoting better aeration and allowing roots to develop more easily. In addition, biochar is renowned for its ability to fix nutrients and make them available to plants over the long term, reducing the need for chemical fertilisers.
Biochar also encourages increased microbial activity in the soil, creating a favourable environment for beneficial organisms that support plant health. Finally, the use of biochar contributes to carbon sequestration in the soil, playing a role in reducing greenhouse gases and combating climate change.
If your aim is to make the soil in your garden more absorbent and reduce the need for watering, biochar is undoubtedly the ultimate trick to adopt. Simple to use and packed with benefits, it transforms not only the structure of the soil, but also its ability to retain water and nourish plants in a sustainable way.
So why not try this ancient but resolutely modern technique for optimising water use and improving the health of your garden? You’ll be amazed at the results!
