Senna marilandica, commonly known as Maryland senna, Maryland wild senna, and wild senna, is a perennial that is native to the United States. It blooms in the summer with yellow flowers, followed by long seed pods, and can grow up to 2 m (6 ft) tall. It prefers average to wet soil.

S. marilandica is native in the United States from Nebraska to the west, Florida and Texas to the south, Wisconsin to the north, and New York to the east. It is a species of special concern in Wisconsin. 

The flowers bloom from early July through late August, and the seed pods form from early August through late September. Bumblebees, butterflies, and solitary bees visit the flowers, and ants, parasitic wasps, and lady beetles feed on the nectar. It is a larval host to many butterflies incliding the cloudless sulphur (Phoebis sennae), orange-barred sulphur (Phoebis philea), sleepy orange (Eurema nicippe), and little sulphur (Eurema lisa) butterflies.

Type: Hardy perennial

Hardiness zone: 4-10

Height: 48", 120cm

Location: Sun or part shade

Seeds per packet: 10