Irises do well in most regions of North America and are hardy from zones 5 - 9; they bloom best in full sun but can also be planted in partial shade.

How many hours of sun do Irises need?

They need at least six hours of direct sunlight in most climates. Lots of sunshine also helps to prevent problem #2 (rhizome rot).

What iris grows in shade?

While most iris will tolerate some shade, especially in hotter climates, the stinking iris (Iris foetidissima) is the most shade tolerant of the iris species. While it also thrives in sun and partial shade, the stinking iris, also known as Gladwin or coral iris, adds color to shaded woodland gardens.