I don't know what this is. It never grew very big until this year. I saw a whole group of them in front of an apartment building and they were huge! They were about waist high and the leaves were almost 2' in diameter. The leaves on mine are about 15". I know it's a perennial.
Actually searched the forums and discovered it on this page: http://www.botanicalgarden.ubc.ca/forums/showthread.php?t=29031 It's not the plant in question in the original query, but there is a link by Daniel to this photo. It is petasites japonicus giganteus.
