Silphium astericus Starry Rosinweed

Silphium astericus (Starry Rosinweed) 3 ft. tall, great butterfly nectar plant. Specifically attracts swallowtail butterflies honeybees and many other pollinators.  Nice yellow flowers July through September. Basal leaves very rough to the touch. Full sun; well drained or sandy soils.
1gallon
Zone 5?-9