Hydrangea pruning is certainly an urgent question here at the moment. I recently answered Mike, who has ‘Endless Summer’ blue hydrangeas about what to do with his. Read this first in case it applies: https://awaytogarden.com/forum/viewtopic.php?f=25&t=40&hilit=hydrangea Assuming yours are NOT continuous-blooming ‘ Endless Summer,’ but are in fact H. macrophylla or "mop-top" hydrangeas that are usually blue in color, they bloom on buds carried through the winter on one-year-old wood. So at any time you can cut out (to the base) any stems that are than that without sacrificing this year’s blossoms. The best time would have been to do this after flower, late summer-ish last year, so it was really obvious what had just bloomed (and therefore wouldn’t again next year). But you can usually tell because they are the thickest, and often you can see remnants of last year’s flowers on them. Sometimes taking out these oldest stems will reduce the overall size of the plant. I am a little confused by your mention of pink blossoms. Do you mean pink conical (instead of round) flowerheads, later in the season, starting out ivory and turning beige-pink tones? If so these are a different species of Hydrangea altogether, H. paniculata, and have completely different pruning requirements from the blue moptop types. They are pruned in early spring virtually as hard as you like, because they bloom on new wood, not last year’s, so spring pruning doesn’t risk this season’s bloom. Or do you mean moptops that have turned pink because of soil pH? I want to help…but don’t want to give you the wrong advice without knowing just which plants you have. And welcome, by the way. I think I forgot to say that. Margaret
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.