Is soot good for my allotment?
Is Soot Good for My Allotment
Certified GKH Gardening Expert
It depends on the type of soot.
Wood ash is considered a good amendment for your compost, but should not be added to an actively growing garden directly, though you can add it to the soil in the fall and it will be fine for plants by spring.
Coal ash, like from coal or BBQ briquettes, should not be added to the garden or compost.