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I have a woodburner (smokeless zone compliant before anyone asks), which produces about two sackfulls each winter. I use it sprinkled around allium crops, and gooseberries, as they both benefit from extra potash. The secret is to bag it up properly so that it can be stored 'till needed, and applied at just the time the crop most benefits. Otherwise you end up wandering around with a bucket wondering where to dispose of it.Another approach is to sprinkle it in to the compost pile. Compost being acid, neutralises the alkaline ash (and the compost can 'tie up' the soluble minerals, turning it into a more long-term fertiliser).What is VITAL is to ensure that no treated timber goes in to the stove, otherwise you are going to be adding toxic salts of chromium, copper and arsenic to your soil. Wood treated for domestic use (like gardening) is now banned from containing arsenate compounds, but wood intended for construction (pressure treated posts etc) probably will.I avoid using treated timber such as decking to make raised beds for the same reason. I just don't need that stuff in my food crops! It leaches out of the wood quite easily.http://en.wikipedia.org/wiki/Wood_preservationShould put you off.