I was given some cannas bulbs & the foliage is tall and beautiful but did not flower. I planted them behind existing hydrangeas next to a wood shed wall. They got about 5 hrs of sun a day. I gave the hydrangeas acid fertilizer & I'm wondering if that was bad for the cannas & made them not flower. Do you have more info for flowering?
Some cannas won't flower if the bulbs didn't store enough energy the year before. In that case they will probably flower next year. The amount of light may also be a problem- cannas ideally need 6 hours of light or more. Cannas should be ok in acid soil unless it is very-acid, so you might want to test the pH after the hydrangea fertilizer is added.