Vitex agnus-castus.

I THINK ... if i recall ... dad would let them get hit with FROST ... so the plant went into dormancy ... and put the pot in the garage until all the leaves fell off ... BUT BEFORE THE POT FROZE ..... then HARVESTED the bulb.. and stored it in the house ... bare ... you could also store the pot and all in the basement.. but that can be tricky... if you have no experience.. but you have to start learning somewhere ... if not a bulb.. google up rooting such ... you might be able to continually root and reroot thru winter... and end up with a nice starter plant in spring ... but trying to keep this giant looking nice all winter.. might become tricky also .... trying both methods . usually ends up with an experienced gardener ... knowing to throw them out in fall .. lol .. it was fun to learn ... but ended up being a PIA in the long run ... but we learned such.. by doing such .... ken

The flower will confirm it, I don't think you can be sure until that occurs.

Well, it looks like a Eucomis, but I can't say I've ever seen a variegated foliage Eucomis with flowers that color.