Name: Jeanie Minnesota (Zone 4a) Replace your lawn with a garden!
Meri, so sorry I have been offline for a while...my computer died and it took some time for me to replace it. Yes, some varieties of bugbane can be 5-6 feet, including the flower spikes. I would guess the foliage on mine is around 4 feet high so far, but it may not yet be full size.
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Old gardeners never die. They are just pruned and repotted.