Iris may be rhizomatous or bulbous perennials, with narrowly leaves and erect stems bearing flowers with 3 large spreading or pendent fall petals, alternating with 3 erect, often smaller, standard petals, in late winter, spring or early summer
Tall Bearded irises are herbaceous rhizomatous perennials to 70cm or more, with flowers 10-20cm across, bearded on the falls, in late spring and early summer
'Titan's Glory' is an herbaceous perennial to 1m in height, with glaucous green foliage and large, fragrant, ruffled, deep indigo-blue flowers in early summer