- You will get 100+ Seeds of Maximilian Prairie Sunflower Flower Seeds. - Seller Notes “Helianthus Maximiliani. U.S. Grown seed. Tested 1/23-Germination 94%. Packed 1/23.”. - Planting Time: Perennial. - Soil Type: Poor soils, Clay, Loam, Peat, Sand. - Life Cycle: Perennial. - USDA Hardiness Zone (°F): 6 (-10 to 0 °F). - Soil pH: Neutral. - Watering: Medium. - Sunlight: Full Sun. - Maximilian Sunflower aka Prairie Sunflower. Perennial. American wildflower native to the plains and southwest. Can be grown in all zones. Maximilian sunflower is a tall perennial which is a member of the true sunflower family. Bright yellow 3" blooms occur in late summer and bloom until first frost. This plant can reach 10' and makes a great green fence. There are tough as nails and are pretty much carefree once established. Deer resistant. One of my favorite plants.100+ Quality seeds per order. Thank You!. - 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!!. - Helianthus Maximiliani. - Full sun / P. Shade. - Spring, soil temp 70F+. - SOW 1/8" deep. 6" apart. Keep moist. - Germination 7 - 28 Days. - Medium water. - Flowers are yellow. Blooms late summer through late fall.