Here in northern Europe we plant our Cannas outside in early to mid May and we bring them back indoors again in late October, or early November. So for six months of the year our Cannas are stuck away, normally out of sight, and left to get on with it; whatever that means.
That is half the life-time of our Cannas, where we don't really understand what is going on. Cannas are not bulbs, they do not have a dormant period. They grow for 52 weeks each year and bad things that happen to our Cannas happen during that 6 month period, where they are trying to grow, but the environment does not allow it.
A few articles follow, which explore the lost six months. In the meantime, here is a picture of a Canna 'Africa' in full bloom! It is not shown for any good reason, other than it is not a well known cultivar, so the picture may be interesting.
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