@res If they are getting out of hand you wiil have to tackle the job now. The best time is early May so that new leaves have a chance to grow and mature without the risk of frost.
Now and you do risk leaf burn ,going into Autumn frosts will also burn newly forming leaves. I don't know how big they are or how much you want to cut if they were my plants I would just do it now and take the risk. With strange weather patterns advice on pruning will become more complex. Just to add every cut you make two more stems will develop. Shearers rip leaves so secatuers or hand loppers are best.
I have worked as a Gardener for 24 years. My latest garden is a new build garden on heavy clay.
If you have a long hedge it would take forever with shears or secateurs, we go over ours with a hedge cutter, the leaves that get cut in half soon go brown and drop off.
Gardening on the wild, windy west side of Dartmoor.
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Now and you do risk leaf burn ,going into Autumn frosts will also burn newly forming leaves.
I don't know how big they are or how much you want to cut if they were my plants I would just do it now and take the risk.
With strange weather patterns advice on pruning will become more complex.
Just to add every cut you make two more stems will develop. Shearers rip leaves so secatuers or hand loppers are best.
I live in west central Scotland - not where that photo is...
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."