The Hardy Plant Society is a British charity that promotes the cultivation of hardy herbaceous plants. The society was founded in 1957 by a group of gardeners and nurserymen. It has approximately 7,500 members and provides information about familiar and less well known perennials, how to grow them and where they may be obtained. The society also works towards ensuring that garden-worthy perennial plants remain in cultivation and have the widest distribution. Its president is Roy Lancaster.