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AI’d wait until early spring as you don’t want to encourage new growth right now – it’s been quite a warm winter but there could be cold yet to come.
Around mid-March cut off the old flowers and trim the stem back to just above a healthy looking bud.
You can also completely remove some stems if it’s getting a bit congested.
Annabelle produces flowers on new growth so there’s no danger of removing flowering buds while pruning.