- You Will Get 20 Seeds Of Blue & Purple Oregon Iris ( Tough-Leaf Iris ) Iris Tenax Flower Seeds. - Description: - Name: Oregon Iris. - Other Common Names: Tough-Leaf Iris. - Scientific Name: Iris Tenax. - Color: Blue - Purple With White & Yellow Spots. - Plant Seeds: Fall / Cold Stratify 2-3 Months At 40f. - Plant Height: 6 - 12". - Plant Spacing: 9 - 15". - Bloom Time: Early Spring. - Hardiness Zone: 7 – 10. - Light Requirements: Part Shade. - Soil & Water Preferences: Dry.