Answer: Polygonum aubertii (sometimes listed as Fallopia aubertii) or silver lace vine does best in a full sun location with well drained soil. If the planting site is in a low spot or otherwise extra wet, that might have caused them to fail. Also, especially the first winter while they are still relatively new and not yet fully rooted and established, you need to mulch them heavily in late fall. And, if you have an expecially cold winter that very first year they might be more susceptible to winter kill -- they are hardy into USDA zone 5. I hope this helps.
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