Symphyotrichum pilosum

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  Root system
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  Stem and branches
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  Hairy stem
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  Stem node and leaves
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  Involucre and phyllaries
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  Flower head close up

Symphyotrichum pilosum is native to central and eastern North America where it is found in Canada and the United States.[7] It is widespread and common throughout its range. Its natural habitat includes communities such as prairies, open woodlands, and outcrops. In general, it responds positively to disturbance, and is often seen occupying sunny, weedy habitats.[8][9]

Two varieties are recognized, although determining the best taxonomy for this group is difficult due to polyploidy and hybridization.[10] The two currently recognized varieties are as follows:[7]

• S. pilosum var. pilosum — stems and leaves hairy, widespread and often weedy
• S. pilosum var. pringlei — commonly called Pringle's aster[4] and named for American botanist Cyrus Guernsey Pringle;[11] stems and leaves mostly smooth, found on alvars, cedar glades, and sand dunes[8]

Symphyotrichum pilosum var. pringlei[12] and its cultivar 'Ochtendgloren'[13] have both won the Royal Horticultural Society's Award of Garden Merit.[14]