You can plant as many as you can find or afford!

There's a huge, breathtaking garden of them at a city park in East Dallas.

The designers built rounded berms to cushion the recreation buildings & ballfields from the noise of a busy street, & planted cannas "wall to wall" on those berms, shorter ones toward the street & playing fields, taller ones in the middle.

Cannas need protection from strong winds, which will catch those big leaves like sails & whip them to shreds, & they do better if they aren't crowded right together competing for nutrients (don't know how fast they'll spread in Ontario, but you'll have to dig them out & separate them as they multiply.)

Even here in Texas, they love full sun, so I'd probably look for a southern exposure, maybe even a warm brick or stone wall for extra heat.

I have some coral canna indica Indian shot close to a big coral honeysuckle;
it's beautiful, & supposedly both plants are attractive to hummingbirds (I never can see hummers, but my neighbor assures me they're there!)

Best luck, & enjoy!

Hi! I know I'm a few months late in replying, but I don't usually visit this part of the forums. Some of the nicest canna beds I've seen are simple a bed of cannas (usually oval or circular beds) with clean edges cut into the grass (no bricks/boarder between bed and grass, just a nice cut edge on the grass). Some other really nice canna beds I've seen are circular filled with cannas, and elephant's ears edging the rim of the bed.

Here's a few of mine.
http://s188.photobucket.com/albums/z308/urraymcbdz/cannas/?action=view¤t=june2009fl2376.jpg

just look through. These where over a month ago so they are much fuller and bigger now.
Pattie

Here is a link that might be useful: