Answer: This plant is hardy to zone 7, but as with any planton the edge of its hardiness zone, may be somewhat less hardy during the establishment phase. An above ground container will not afford the root protection that a deeply rooted in-ground planting would have, and a recently heeled in plant would also be less protected especially if there repeated are freeze thaw cycles or cold temperatures without benefit of snow cover. Bamboos may die back to the ground during winter and then regrow grom the roots. Allow your plants some time to see if they will recover or not. For next winter you may want to consider bringing the containers inside a protected unheated area.
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