Posted: 26/03/2016 at 17:19
Pretty much agree with hosta...early start is essential for long flowering of cannas.
however,,mine are outside....mild s.w. ....In large pots and in the ground and already making lots of growth. They start flowering in mid summer here. a cold frame should be sufficient if it is not too cold there Winter. Right now, when temps are not great at night, I would not push them. Two or three weeks' time and it will be warmer and then growth more noticeable.
Get cannas in big pots asap. cannas, of course, need sun but in pots they need to be well watered and fed during the growing season.....don't let them dry out.