Plants in genus silphium
Silphium radula
Silphium radula is a herbaceous perennial native to the South Central United States, known for its large, showy yellow flowers in summer. It grows in prairies with sandy or calcareous soil and features thick white-haired stems and triangular green leaves. This plant prefers soil that is not too rich or wet, making it a resilient choice for native plant gardens.
Silphium terebinthinaceum
Silphium terebinthinaceum, a member of the Asteraceae family, is native to central and eastern North America. Known for its resinous sap with a sweet smell, it has been used in traditional medicine. This herbaceous perennial grows 3 to 10 feet tall and produces small yellow flowers in summer. Its large taproot allows it to survive drought and recover quickly after wildfires. It attracts native bees and hummingbirds, making it an important plant for pollinators.
Silphium laciniatum
Silphium laciniatum is a taprooted perennial herb native to North America, known for its deeply cut foliage that orients north/south to avoid midday sun. It features large flower heads with sunflower-like blooms and is cultivated in gardens for its unique appearance.
Silphium albiflorum
Silphium albiflorum is a tall perennial endemic to Texas, known for its white flowers in a typically yellow-flowered genus. It grows in open, calcareous prairies and is drought-tolerant, with deep roots reaching up to 15 feet.
Silphium perfoliatum
Silphium perfoliatum, native to North America, is a tall perennial with triangular toothed leaves and daisy-like yellow flowers. Known as the cup plant, its leaves form a cup around the stem that holds water for wildlife. This plant is drought-resistant, attracts pollinators, and is used in prairie restorations and naturalistic landscapes.
Silphium asteriscus var. dentatum
Silphium asteriscus var. dentatum is a North Carolina native plant that grows nearly 7 feet tall with yellow daisy-like flowers. It is a perennial that attracts butterflies and thrives in sunny locations. This plant is well-suited for rain gardens and can add height and color to perennial borders. Its robust growth and cheerful blooms make it a favorite among gardeners.