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Can be used as an organic source of potash (carbonate of potash) but due to the variable nature of the wood burned to obtain the ash, it is difficult to accurately predict the amount of available potash in a given sample. Estimates vary between 4% and 15%.
Wood ash is highly alkaline and may help to neutralize acidic soil but would not be recommended for use on alkaline soils. A generally safe rate of application would be 4-8 oz. per sq. yard of bed space. Keep ashes dry if stored to avoid loss of potash.
