- You will get 100+ Seeds of Purple Giant Hyssop Flower Seeds. - Seller Notes “Agastache scrophulariaefolia . U.S. Grown Seed. Organic. Tested 1/23-Germination 93%. Packed 1/23.”. - Planting Time: Perennial. - Soil Type: Clay, Loam, Peat, Sand. - Life Cycle: Perennial. - USDA Hardiness Zone (°F): 7 (0 to 10 °F). - Soil pH: Neutral. - Watering: Medium. - Sunlight: Full Sun. - Giant Purple Hyssop. Large blue & lavender bottle brush blooms on spikes that can get 6ft tall. Very fragrant. Butterfly, Bee and Hummingbird attractor. Very easy to grow from seed. Perennial. Pretty much a carefree plant after established. Mature plants are somewhat drought tolerant. They are great cut flowers and dried. The flowers smell like black licorice when crushed. Blooms all summer into fall. It's amazing that this giant plant comes from this little, tiny seed.100+Quality seeds per order. - Some American Native Wildflower seeds need to go through a cold winter to germinate. This plant is one of them. They do this so the seed won’t sprout in fall, only to have the seedling not make it through a cold winter. I have stratified these seeds to simulate a cold winter(stratification) This raises the germination rate considerably. Thanks for looking!!. - Agastache scrophulariaefolia . - Perennial herb/flower. - Spring, soil temp 70F+. - Full sun. - SOW 3-4 seeds per plant,1/16"deep,24"apart. Keep moist. - Germination 14-21 days. - Medium water, light fertilizer. - Flowers are Blue/Lavender. Blooms from early summer through fall.