This is my second year (2016) with both the yellow and the purple form of this lovely little iris. The yellow one bloomed pretty much nonstop all summer and into fall, until killing frost. This is the first year for the purple form to bloom.
This year it is a solid mass of blooms starting the first part of March. Very tough and seems to be drought tolerant growing in sandy loam.
Evergreen, and suffered no damage from a very long and wet winter season.