25 Fresh Seeds Wild Blue Iris Flower Seeds The Wild Blue Iris flower is categorized as a perennial flowering plant. It grows quickly, establishing a deep root system. It will later wilt with harsh killing frosts, only to return again the following growing season. If temperatures become too harsh, the plants can die, however they can drop seeds to the bare ground to regrow the following year. Once the seeds drop, they will go through the natural wintering process of stratification. Type: Flower. Color: Blue / Violet. Height: 12" to 24" Tall. Width: 12" Spread. Season: Perennial. Zones: All. Environment: Full sun.