Limelight Hydrangea

My limelight hydrangea doesn’t seem to be flowering, or even getting any buds ready to flower. It was planted last summer as quite an established plant and I cut it back about two thirds in January as recommended by the nursery I bought it from. It’s had a lot of green growth since then but no sign of flowering! It’s in quite heavy soil but it does drain well and I give it plenty of water and it’s on a sunny fence. Any ideas? I’ve attached a photo for reference - also looks like something is eating the leaves?!
Thanks!
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I live in west central Scotland - not where that photo is...
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw