Add a touch of the exotic to your garden with Gunnera manicata, also known as Brazilian giant-rhubarb or dinosaur food. Native to Brazil and thought to be around 150 million years old, this clump-forming herbaceous perennial can reach heights of up to 10ft and spreads to over 13ft. Its impressive leaves, which can reach diameters of over 4ft, are its main feature, and are often used for creating an impact in damp areas near garden ponds. Despite its common name, it is not closely related to rhubarb. This plant has gained the Royal Horticultural Society's Award of Garden Merit, and has been known for its medicinal properties in traditional Brazilian medicine. Add a touch of prehistoric charm to your garden with Gunnera manicata.