Posted: 14/02/2013 at 23:36
i have been saving charcoal from my wood stove to use mixed in compost for my house plants.
1.put the charcoal in a strong bucket and soak it in a either worm/comfrey or nettle "tea" for a week or 2.
2.pour off any tea that remains, then leave charcoal to dry out.
3.once dry, pound the charcoal (in the bucket) into a powder and add to compost.
the charcoal will slowly release nutrients into the compost.
it is also possible to use a product called biochar which comes in big bags.
here's a link you might find interesting.