- You Will Get 21 Seeds Of Iris, Western Blue Flag Iris, Flower Seeds. - Perennial. - Blue. - 12 to 36 inches tall. - Full sun or part shade. - Hardy zones 5-9. - This amazing variety of iris grows to full bloom from seed!! It produces beautiful large blue blooms. Also known as western blue flag iris, it is native to a range between Colorado and California, but can grow just about anywhere in the US. - This is an inexpensive way to get irises as opposed to buying the heavy, already established rhizomes. It does Establish rhizomes, and comes back every year. Best in full sun, light soil, with good drainage. Comes with planting instructions. In addition, germination of this seed can be improved by scarification, then 90-180 days cool moist stratification. Or plant outside in the fall in moist soil for delayed germination.