It depends on how far back you want to prune it as Forsythias flower on old wood and the buds for next year may already be forming. If cutting back hard you may not get a great yellow display next year (or longer).
Forsythias send out new growth right up until Autumn and this growth can be pretty vigorous in the right conditions, needing a light trim every couple of months (or sooner!) to keep them tidy, compact or train them to a required shape. Trimming the green stems shouldn't affect the flowering for the following season.
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I think so but if you must you can, you may lose the flowers next year though, I always do them immediately after flowering.
Take just the old flowering stems off, try to leave as much new growth as possible.
Last edited: 19 June 2017 11:00:54
Thanks Lyn. ill leave it.
It depends on how far back you want to prune it as Forsythias flower on old wood and the buds for next year may already be forming. If cutting back hard you may not get a great yellow display next year (or longer).
Forsythias send out new growth right up until Autumn and this growth can be pretty vigorous in the right conditions, needing a light trim every couple of months (or sooner!) to keep them tidy, compact or train them to a required shape. Trimming the green stems shouldn't affect the flowering for the following season.
It is usually recommended that one third of the branches that have flowered are cut out each year, after flowering.
Thank you to everyone who replied