A few thoughts -
It has been a cold winter and where I am it's still blummin cold, so it's probably just taking it's time. Most of the stuff in our garden is looking a tad miserable at the moment, and I'm sure with a bit of warmth things will perk up

Does it sucker? If so when it warms up you will see some new shoots.
I find bamboo's pretty indestructable
My other thought is that its often not the cold that kills things but the wet and cold. So some things in pots can rot away. Over the years I've lost more things because of the wet than the cold
Maybe have a firkle and see what's happening
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