Answer: My references list softwood or semi-ripe cuttings from late spring to late summer; hardwood cuttings in winter, or root cuttings in winter. Seeds were not listed. However, a plant source database search came up with the following possibilities for seeds for Polygonus aubertii. You will need to check with them directly for availability.
Fragrant Path ($2.00) P.O. Box 328 Fort Calhoun, NE USA 68023 (no website listed, but there may be one)
Underwood Gardens, Ltd. 1414 Zimmerman Road Woodstock, IL USA 60098 http://www.grandmasgarden.com
Q&A Library Searching Tips