Compost containing decomposed rhubarb leaves can be safely worked into the soil of vegetable gardens. The leaves do contain poisonous materials (oxalic acid and soluble oxalates), however, these rapidly decompose in the compost pile and do not negatively impact compost quality. Oxalic acid and soluble oxalates are also not readily absorbed by the roots of plants.
Answered on April 27, 2015
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