I have two "Wyoming" cannas in containers on my deck. I started the rhizomes indoors under a HID light around Feb. 20 and put them out in full sun May 10. As of last week they only had 3 large leaves apiece, but after a week of summery weather (lows above 65, highs 80-90) they've shot out 2 more leaves and are now sprouting additional shoots from the ground, taking off like crazy now. I take it they like heat!! Is that normal?