Allendan Seed Company

Helianthus grosseserratus - Saw-tooth Sunflower

Image of Saw-tooth Sunflower (Helianthus grosseserratus) taken by Allendan Seed Company
SKU: 86
Return Policy

Saw-tooth Sunflower (Helianthus grosseserratus) is a hardy perennial and can form in dense colonies or as a stand-alone plant. Its strong central stem is often red or reddish-purple in color, and there is very little branching except for flowering stems towards the top half of the plant. Its leaves are oblong and dark green with a sandpapery texture due to tiny stiff hairs. The upper stems terminate into individual or small clusters of bright yellow flowers. Its height can vary widely, if it is in a dense colony it will grow 3' - 5' and stand-alone plants can grow up to 12 feet.


Soil Moisture:  Moderate

Sun Exposure:  Full Sun

Height:  3' - 12'

Spread:  2' - 3'

Hardiness Zone:  3 - 8

Bloom Color:  Yellow

Bloom Time:  August, September, October

Attracts:  Birds, Butterflies, Pollinators



There are about 70 species of Helianthus plants that consist of annual and perennial flowering plants, commonly called sunflowers, and are native to North, Central, and South America. They are usually tall plants with disc flowers that for the majority of species are yellow, but there are some species with reddish lobes. Before blooming, young sunflower heads follow the sun across the sky and at night they reorient themselves to face East for the sunrise. Once the flower heads are mature and fully open, they generally stop moving with the sun and remain facing East.    

Return Policy

Returns of standard seed mixes and individual species must be made in the original unopened packaging within 10 days of delivery. If you wish to return live plants, you must do so within 5 days of delivery. Returns of standard mixes, individual species, and live plants are subject to a restocking fee of 25%. Custom seed mixes may not be returned. When returning non-damaged goods, the buyer is responsible for shipping charges, and return shipping may be made by whatever means the buyer selects.

Allendan Seed Company warrants that the seed it sells will conform to the label description as required under state and federal seed laws. The seed labels show independent lab testing results, and the absence of weed seed is not represented or guaranteed. It makes no warranties, expressed or implied, of merchantability, fitness for purpose, or otherwise, which would extend beyond such descriptions. In any event its liability for breach of any warranty or contract with respect to such seed or plants is limited to the purchase price only. Allendan Seed Company further limits to the purchase price any liability of any kind on account of any negligence whatsoever on its part with respect to such seed or plants. By acceptance of the seed or plants, the buyer acknowledges that the limitations and disclaimers herein described are conditions of sale and that they constitute the entire agreement between the parties regarding warranty or any other liability.

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