Perennial plants are herbaceous plants which die back to the ground during winter and grow back in spring. Some can be left undisturbed for years while others need to be divided every few years to maintain their vigour. You can find a perennial plant for any situation, whether it's a stone wall or a shady corner. Some are grown for their flower displays, others for their beautiful foliage. Evergreen perennials and half-shrubs are included in this category.
Iberis - Candy tuft
Iberis is a genus of around 50 species in the Brassicaceae, most of which are native to regions around the Mediterranean. Those species that can be grown here in Iceland are well suited to rock gardens as they need very sharp drainage and full sun.
Iliamna - Wild hollyhocks
Iliamna is a genus of 7 similar species all native to N-America. The genus seems to be named after Iliamna lake in Alaska, although none of it's species grow in Alaska. The genus belongs to the mallow family, Malvaceaea and like many species of that family, they are tall, bushy plants with tall spikes of flowers which resemble hollyhocks.
Inula is a fairly large genus of around 90 species in the aster family, Asteraceae, native to Europe, Asia and Africa. They are very varied in size, but the flowers are distinctive with very many, narrow ray-florets.
Iris is a large genus of close to 300 species in the iris family, Iridaceae. The word iris is from Greek and means rainbow, which refers to the colourful flowers of species in the genus. Nearly all species are native to temperate regions in the northern hemisphere where they grow in varied habitats, from dry alpine conditions, to meadows and marshes.