Reply To: Wood ash for a walnut

Martin Crawford

Is the walnut cropping heavily? Only then would it need that amount of potassium. If that is the case then yes, around 3kg wood ash in total would be useful, but best to apply this in several smaller amounts eg. 1kg in May, 1kg June, 1Kg July – to reduce risk of soluble potassium being washed out of the soil.

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