I am assuming that by using the word soot you actually mean ashes from a wood fire.
Ashes can be used in the garden as a fertilizer and to "sweeten" the soil. Since this will affect the PH of the soil don't add an excessive amount . You might want to give some thought to what is currently in the garden and/or what is planned. I say this because some plants don't like a high PH level so keep that in mind when out there sprinkling the ashes around.
Ashes can be used in the garden as a fertilizer and to "sweeten" the soil. Since this will affect the PH of the soil don't add an excessive amount . You might want to give some thought to what is currently in the garden and/or what is planned. I say this because some plants don't like a high PH level so keep that in mind when out there sprinkling the ashes around.