Plant them in full sun to part shade, and carefree Siberian irises (Iris sibirica) will bloom in early summer. After the flowers finish, don’t remove the leaves. They’ll soak up the sun to power the next season’s blooms and die back naturally. In the meantime, they’ll add texture to the garden. You can find Siberian iris in many colors, including purple, blue, gold, pink, white and burgundy. Give them moist soil, and they’ll grow 34 inches tall by 18 to 24 inches across. They’re hardy perennials in USDA Zones 3 to 9.