Irises are tough, versatile perennials. But even though they were named for the goddess of the rainbow, not everyone knows that they come in a huge range of colors and patterns, or that there are irises that thrive in a wide variety of growing conditions, from sunny to shady, and dry to wet. Stephanie Markham is an expert grower and taught us so more about the irises that can bring a piece of the rainbow into your garden.