The Wild Iris The iris is the February birth flower and is cultivated all over the world. Iris are hardy herbaceous perennials and are native to North Temperate regions. Iris comes from a large genus of bulbous and rhizomatous perennials. This perennial herb can grow in water and on land. An iris can be grown from a creeping rhizomes or a bulb, they clump and multiply beautifully and create a tall vertical presence in the garden. Some of them grow in deserts, some grow in swamps and some in the cold far north and others in temperate climates. Its sword-like foliage is very attractive when the plant is not in bloom. Most irises need full sun and they are easy-to-grow perennials.