Seeds from Apocynum cannabinum Dogbane Indianhemp. Butterfly magnet for all types of butterflies. This plant is happiest growing in moist soil in zones 3 to 9b. This 4 foot plant is popular with small insect pollinators. These gorgeous cream to pink and sometimes blue, they like full to part sun. This variety tolerates very dry conditions very well. The plant’s strong fibers have made it prized for cordage and threads for centuries.