There is a Hardy Tropical UK forum for people who grow exotic plants here: www.hardytropicals.co.uk/forum/viewforum.php?f=1
From what I have read there, (have frequently browsed it) many of the tropical plants they grow have to be brought under cover in the winter, quite a job if you aren't vary able. Some that are left in situ need to be wrapped as protection from frosts, so quite high maintenance.
You can achieve a tropical look with annual bedding plants such as coleus, but cannas do need lifting in autumn.
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