Irises grow from underground bulbs or fleshy roots called rhizomes and, with proper care, the National Gardening Association says they'll regrow season after season in zones 3 though 8, or even zone 10 in dry climates.
Irises will bloom best in full sun, meaning at least 6 to 8 hours of sunlight per day. They can tolerate as little as half a day of sun, but it's not ideal. Without enough light, they won't bloom well. Bearded irises must not be shaded out by other plants; many do best in a special bed on their own.
Growing irises from bulbs is easy and provides some of the earliest blooms in the garden; later-flowering varieties compliment summer-flowering plants. Whether in containers or in the open garden, they are hardy and provide colour year after year.. . . . .364011235826!]0000000000000009783314146569!]
