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Today i've found the leaves on young plant has got mottled yellow tops and the underside is covered in a kind of rust type effect! this has only just appeared, would like to know if this is due to recent heavy rain after dry spell or too cold! Should i lift the plant after removing damaged leaves and overwinter in greenhouse, as hasn't flowered yet?
These campanulas are hardy so having it inside isnt needed. The leaves are probably beginning to die back now because of the shortening day length & reduction in average temperatures. Yes if you suspect rust then removing those leaves is a good idea- dont compost, bin them.
I'd expect it to resume growing again next Spring as normal & flower next year. IME slugs & snails love it, so protection of the emerging shoots from that attack is advised. J.
Thanks joe4eyes it was the rust that threw me, as they were perfectly healthy a few days ago!