I have about 20+ cannas in a little 3 by 3ft area and they are all 5 or 6 ft. What do I do with them?? I moved into this house last year and these were hear and I don't think they really took care of anything just planted tons of stuff and left it. I left them there over the winter last year and they obviously didn't die. I would love to have less in that area and I am hoping I can cut them down to the ground so maybe they won't get so big next year??