Indian Hemp ... Dogbane ... 30 Seeds Packet contains (30) fresh seeds. NOTE: Buyers are required to have an import permit or phytosanitary certificate from USDA is required for seeds imported to the US This North American native wildflower is winter hardy in zones 4-9. Small white flowers are produced in clusters in the summer months. Ideal for fall sowing. Otherwise a 12-week period of cold stratification is required.