A beautiful combination for wet conditions is a red (here C. 'Durban') or burgundy canna with variegated Bulrush (Typha latifolia 'Variegata') :

And haha, also with smooth meadow-grass (e.g. for football fields); Poa pratensis :

Our display at the Appeltern Gardens 2007 (The Netherlands) had this remarkable composition with C. 'Panache' :

Lots of these photos and more are included in our non commercial, big screensaver, adapted for all screens.

temperature
to page about surviving freezing conditions

pledge
Each plant for sale has proven at least the year before that it behaved well (good foliage, good flowering), and the divisions or offspring (seeds) must have at least 2 shoots with more than one leaf.
The history of the plant is well documented and can be shown when asked for.

And here's a page of observed infections. We're severe in digarding suspicious plants.