Sawtooth sunflower (Helianthus grosseserratus) is a striking perennial for late-season color in a large garden. Where there is competition from close companions—in a meadow setting or in a tightly packed border, for instance—the plants typically stay in the range of 5 to 6 feet tall. Set out in a new planting, or another spot with loose, rich soil, it can shoot up to 8 feet or more (and then likely keel over), so consider cutting it back by 1/3 to 1/2 in midsummer if it looks like it’s going to get taller than expected. Contrary to what you might expect from the common name, the leaves are not toothed.
In late summer to early fall, the upper parts of the smooth, reddish stems carry many single, bright yellow, daisy-form flowers. Like other perennial sunflowers, its blooms are a marvelous pollen and nectar source for a wide range of insect visitors, and birds adore the seeds. (I end up with only a small amount of seeds, because the goldfinches tend to get them first.) US native. Full sun; best in moist soil. Perennial; Zones 3 to 9.
Harvested in September 2022. At least 15 seeds. Ecotype unknown.
Please read the germination information as well before ordering.
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