I planted a Canna Lily two summers ago. Last year when it started growing I was amazed to see it had quadrupled in size. I had cut it down during the previous fall at the end of the season. However, last year, I was out of the area at the end of its growing season and unable to do so. I cut it back when I did get home hoping for the best. Now, mid-April, there are still no visible signs of life. Do I need to replace it? or, should I give it some more time. Should I try digging it up to check for signs of growth