Hi All, I am in zone 7 Tn...I have just bought some cannas bulbs which I plan to start soon and cant wait....I have never had cannas but I think they are so beautiful...my question is if planted deep enough, will they survive winters in Tn. It gets to about 20 at night for roughly a few weeks with some nights a bit colder...most of the winter its above freezing and we never get a solid freeze...The days are roughly around 40 for the coldest months..I plan to grow them in pots and then transplant when they are bigger...I am growing them in 3 gallon containers...thanks all for your help

Steve