Black-Eyed Susan (Rudbeckia hirta)
Common names
Black-Eyed Susan, Yellow Daisy
Plant Family
Asteraceae
North American Native
Yes
Description/Taxonomy
Leaves and stems are covered in hairy trichomes, and its name "hirta" translates to "hairy" in Latin. A dark center disk surrounded by bright yellow petals gives it the name "black-eyed". Named Rudbeckia, by Carl Linnaeus after Swedish botanist Olaf Rudbeck.
History
The plant has a rich history of use among Native Americans before it was introduced to the Old World following Columbus's voyage.
Parts Used
Flowers, Leaves, Roots
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Cultivation
The Black-Eyed Susan (hirta) is a short lived-perennial or biennial, that is easy to grow from seed, or bare root rhizomes divisions.
Growing Zones
3-9
Light Requirements
Full Sun, Part Shade
Soil Moisture
Dry
Mature Height
24" - 36" tall
Mature Spread
12" - 24" wide
Bloom Time
Mid to Late Summer
Advantages
Pollinators are attracted to this flower, Deer-resistant, Perennial
Constituents
Sesquiterpene lactones, flavonoid O-glycosides, amino acids and derivatives, quinic acid derivatives, coumaric acid derivatives, hydroxycinnamic acid glycosides, and fatty acids*.
Herbal and Medicinal Uses
Flowers, leaves, and roots have been used for teas, tinctures, and poultices. Compounds in the flowers, leaves, and roots are anti-inflammatory, anti-microbial, and used to boost the immune system.
References
*Preliminary Phytochemical and Biological Evaluation of Rudbeckia hirta Flowers (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10420942/)