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Rhubarb is the crop you are looking for
Rhubarb grows from a root, called a Crown
Rhubarb
Rhubarb
Not to be taken with cardiac medications, diuretics, other laxatives, cathartics or steroids due to potassium loss. Potassium loss can be decreased by combining the rhubarb root with licorice root.
Animals should not eat rhubarb, they will certainly need the attention of a vet. as soon as possible