Best results from your soil come when the charcoal content reaches at least 10%. Performance improves up to a
maximum of 50% charcoal content. It is always important to ensure that there is plenty of organic matter added
to your soil in the usual way, and a high charcoal content will retain both nutrients and moisture.
Our large bags are 33% charcoal. A fairly normal sized bed, 8’ X 4’ for example, will require a prohibitively
expensive amount of Carbon Compost to bring up to 10% charcoal in one season even if we assume a topsoil depth
of just 8”.
Our own experiments have shown that best initial use is to mix up your compost and place it directly under the
plants you wish to benefit from it. By doing this you get immediate results without the cost and can then build
up the charcoal content by adding a bit more Carbon Compost each year.
Please note that Carbon Compost is nitrogen rich and may not be suitable for all plants.
Carbon Compost will aid very sandy and dry soils by adding organic matter and the charcoal content will assist
in retaining moisture and nutrients.
It will also aid clay soils but should be used in conjunction with plenty of organic matter. If your soil is
very heavy clay it is important to add lots of organic matter with the Carbon Compost. As previously mentioned,
the benefits become really apparent from a 10% charcoal concentration so it’s possible to add another 80L of
other compost or well rotted manure to each bag of Carbon Compost and still achieve this.
The Carbon Compost Company will supply the correct concentration for such soils on request.
If you’re lucky (or very hard working) and have nice friable dark soil, Carbon Compost will improve it still further.
The charcoal will provide a reservoir for nutrients, reducing the need to feed each year.