I am sorry for this delayed reply to your gardening question. The spring rush has brought a deluge of questions and we are working hard to catch up!
The hardiness zone range you listed of 4 to 9 is the rating for winter low temps that the plant can tolerate. In the south we need to focus just as much if not more on heat zone rating. Pachysandra (Japanese Spurge) is rated only as far south as heat zone 8 and you are in zone 9. As a result our long, hot and often humid summers are too much for it to thrive here.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
Q&A Library Searching Tips