I cut mine back by 2/3 rds or more before bringing them in. They take up so much less space that way. I have had no problem overwintering them and they grow like crazy once the days start to get longer and warmer. I leave them on a cool porch. In the dormant state temps down in the low 40's don't seem to bother them.
Forgot to add in my initial reply, though they may appear dormant the best way to kill your burgmansia is to let the roots dry out completely like you can with amaryllis ans several other plants you winter over. Just check and give them a drop or two of water every now and then.
Thank you PQ Can you tell me anymore about pruning my brug? Someone told me not to cut it back beyond the "Y"? It is quite tall now, but hasn't formed a Y yet. And should I remove the leaves when I bring it in, or just let them drop naturally?
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