Rhubarb is a plant with poisonous leaves, yet edible stalks. Despite being edible, the stalks are still very tart due to trace amounts of the same poisons, and many people do not like the taste. Molly Weasley was known to cook with it, making a Rhubarb crumble with custard on at least one occasion.
- Harry Potter and the Chamber of Secrets (video game) (Mentioned only)
- Harry Potter and the Order of the Phoenix (Mentioned only)