Rhubarb is a very underrated plant – it produces some of the nicest tasting puddings and is incredibly easy to grow at home. Rhubarb is something of a wonder plant – in addition to an unknown poison in its leaves, they also contain a corrosive acid. If you mix the leaves with water and soda, it becomes even more potent. The stems are edible (and incredibly tasty) and the roots have been used for over 5,000 years as a laxitive and poop-softener.