I came across this interesting abstract that essentially seems to conclude that runners (monopodial rhizomes) are more cold-tolerant than clumpers (sympodial rhizomes) by looking at snow and ice damage during a particularly treacherous winter in China. This is consistent with the experience of those at Needmore Bamboo. They don't seem to have had much luck with Fargesia's in Zone 5b.
I have had pretty good performance from my F. Scabrida in zone 6a/b, and my new F. Robusta seemed to do fairly well early in the winter before I moved it into the garage, but I think planting location, fertilizer, mulch, and winter protection have a lot to do with my modest success.
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