It is recommended that rhubarb not be harvested after mid-June. During the remainder of the summer the plant will build up food reserves, ensuring a good crop next spring. Rhubarb is a spring crop and is sweeter and nicer to eat in the spring. Rhubarb leaves contain oxalic acid and should never be eaten.
Reference: Rhubarb in the Home Garden, PM 719, Iowa State University Extension
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