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You can use wood ash at any time but it is especially beneficial to the bulbs just as the flowers appear.Also it is good that you are burning twiggy growth as that contains the most potassium - large logs have very little.Bone meal contains nitrogen and phosphorus and should be applied in the Autumn or when the bulbs are starting into growth.For my feeding methods check out this bulb log link :- http://www.srgc.org.uk/bulblog/log2005/160205/log.html
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