Helianthus grosseserratus (Sawtooth Sunflower) [15 Seeds]


Germination Information: I recommend these seeds only for gardeners who have experience with seeds that require a chilling period. The easiest approach is to sow the seeds in a pot, about 1/4 inch deep, in fall to midwinter, setting them outdoors in a spot protected from mice so they can get a natural chilling period and then germinate when conditions are right in spring. (The last time I started this species from seed, I sowed outdoors on January 31 and they began sprouting on March 20.)

If you sow after February, give the pot an artificial chilling period of about a month.

Note that this information will not appear on the seed packet you receive.

Please read the description as well before ordering.

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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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