How are your cannas tolerating this heat today? It is 110 right now and mine are toughing it out. I watered everthing well last night. Your Cleopatra leaves look very nice.
When to thin????
I will assume they are fine. I am in Reno, Nevada with my sister.....and it is warm and VERY dry here.
My DH said it was hot and humid.......and generally we are not humid!
Plants are more adaptable than some people I know.