Helianthus maximiliani. Maximilian sunflower is a striking perennial wildflower known for its tall, slender stems and clusters of vibrant yellow blooms. Reaching heights of 3-10 feet, this native sunflower thrives in full sun and well-drained soil, making it perfect for naturalized landscapes, pollinator gardens, or prairie restorations. Blooming from late summer to early fall, its nectar-rich flowers attract bees, butterflies, and birds, while its seeds provide a valuable food source for wildlife. Hardy and drought-tolerant, Maximilian sunflower is low-maintenance and ideal for gardeners seeking a bold, eco-friendly addition to their garden that supports biodiversity and adds seasonal beauty.