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My garden gets wetter more than it gets cold
I should not worry about your cannas, It is said that the whole country is infected with a virus that affects canna. The disease was spread by aphids during the summer and a few national collections have been wiped out. I will leave mine out to take their chances when the frost comes as it might kill the virus.
Distorted growth and mottled colouring, I have heard that the RHS had to abandon some of the canna trials this year as the 2 main viruses are getting worse and more widespread.