Beautiful, colorful and elegant, iris flowers are often the subject of paintings. Gardeners love growing these classic perennials. Several types of iris bulbs and iris rhizomes are available, including German Iris, also called Bearded Iris, that starts off iris season with classic flowers in late spring. Dutch Iris, grown from bulbs, bloom after German Iris. The best iris to plant near water features or ponds are Louisiana, Siberian and Japanese iris. All types of iris feature stunning flowers in the garden and a vase. When selecting iris to buy, some factors to consider are their grow zone, flower color, mature height and soil requirements.