'T-Rex' takes a while to get into its stride, but this imposing herbaceous perennial will eventually expand up to 2m (6ft) with individual leaves stretching over 30cm (12in). Effortlessly filling large gaps with its lush and captivating foliage, characterised by its colossal, matt-green ribbed leaves, this giant plantain lily is as straightforward to cultivate as any other hosta. Adding to its allure, loose clusters of near-white flowers on stems up to 1m 1m (3ft) high will develop in the summer.