Growing Rhubarb

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24 Mar 23 kathy cadler (Canada - Zone 3a Temperate Short Summer climate)
Can I harvest rhubarb all summer in zone 3a safely? I read recently that late summer harvests are poisonous . I’ve heard and have been practicing harvesting 1/3 or less of the plant at a time. Then I wait 2 weeks before harvesting again all summer long. I have big healthy beautiful plants that are over 20 years old.
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