Helianthus maximilianiA beautiful native perennial that blooms in August and September. Features clusters of 3-4" wide showy, bright yellow flowers and grows a statuesque 3-10' tall. A great landscape and garden plant and an important wildlife habitat species. It provides dense cover, substantial volumes of seed for birds, and nectar and pollen for pollinators. Tolerates a wide range of soils, and is drought tolerant. Easily established by seed. This native sunflower is rhizomatous and may spread vigorously, and therefore may not be suitable for small landscape plantings. Full sun. Perennial.
|Approx. Seeds per Packet
||Average Packet Weight
||Seeds / gram
||Average seeds/ oz
|Planting Season||Ideal Soil Temp||Sun||Frost Tolerance|
|After Last Frost||65-75°F||Full Sun||High|
|Sowing Method||Seed Depth||Direct Seed Spacing||Days to Harvest
|Transplant or Direct Seed||1/4"||8-16"||120-160|
|Mature Spacing||Days to Sprout||Production Cycle||Seed Viability|
Sunflower is a frost sensitive annual that prefers full sun and well-drained soil with low to moderate moisture. Drought tolerant once established.
Direct seed outdoors once the danger of frost has passed. Optimum soil temperature for germination is 65-85˚F. Sow 1" deep and 4-6" apart. Seeds will sprout in 5-12 days. Thin so mature plants are 8-10" apart.