I agree with @Obelixx … it needs to be planted in the ground now … I simply don’t understand why you would wait until winter … you’ve already told us it’s not flowering and is looking pale and isn’t doing well … why wait until it’s even worse? It’ll make it far less likely to be a successful move.
If it’s not going to flower there’s no reason why you couldn’t cut it back now if that’s what you’re concerned about.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.