The plant in Annie's picture is Amorphophallis konjac - not Dracunculus vulgaris. I have grown both of these plants and Amorphophallis is winter hardy in zone 5 if in a protected spot.

Here is the info on Drucunculus - like gg said, it is easy to confuse the aroids!!

https://en.wikipedia.org/wiki/Dracunculus_vulgaris

- here is the info on Amorphophallus - https://en.wikipedia.org/wiki/Konjac

These two plants are different from each other - the differences are obvious if you have grown both of them - and I have!