Tall Sunflower or Giant Sunflower Asteraceae:
Plants grow 6 to 15 feet (15 ft = 4.57 m) tall, produce many sunflower heads in late summer and fall. Flower heads are large with ray florets golden yellow and disk florets yellow to dull yellow. The stems are rough and often tinted red. The leaves are elongated and lanceolate shaped, and attached directly to the stem, some leaves may have a very short leaf petiole. The leaf margins are finely toothed. Prefers moist soils in full sun. Plants can be aggressive growing and often spread by way of rhizomatous stems, forming large dense colonies. Birds love the seeds in the fall and early winter.
Cover seeds and use 45 to 55F (55 F = 12.8 C) with germination starting in 5 to 24 days and spread out over many weeks. If little germ. move to 27 to 39F (39F = 3.9 C) for 6 weeks.