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Rhubarb Leaf Recipe
I have been trying to find some information (for my husband - the gardener in the family) on the use of oxalic acid as a pest preventative. I have no idea how this is prepared or the strength to use (presumably as a spray). I believe oxalic acid is found in rhubarb leaves, and we have plenty very large ones in our organic garden. If we used these as the source of the acid, how should we do this?
I hope you can help, and thank you for offering this service.
Boil three pound of rhubarb leaves for half an hour in three quarts of water. Strain. When cold, dissolve one ounce of soapflakes in one quart of water. Combine the two and use as a spray. Has shown to be effective against aphids. Beware, oxalic acid is poisonous!