Tiffany, I'll try and figure it out. I might try it both ways as insurance.
Skylark, which variety of cannas are you growing? Right now I have some smallish ones, under 30" but I have grown 7' ones in the past. The Horn Canna catalog lists the height of different varieties.
Minds are like parachutes; they work better when they are open.
Tiffany, I'll try and figure it out. 
I might try it both ways as insurance. 
