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Pruning shrubs

When do you prune forsythia and how far back can you take it? We have just moved to a new house and the shrub boarder is out of control, taking up almost 8ft all around the garden. I don't want to kill the forsythia but we have 4 huge ones and would like to shrink them ddown thank you
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You prune them straight after they have flowered. They can be pruned fairly hard. I use a hedge cutter.
They are in full bloom now. I will have at them when they finish. Thank you
Thank you for all of your advice