Let’s hear more about the shrub and how you’re caring for it: Does it have good green leaves in abundance? What light is it sited in (at least half-day sun?). When did you cut it back, or have you pruned at all? Pee Gees and all the paniculata hydrangeas bloom on new wood (current year’s wood), so they are pruned in early spring, before new growth begins pushing (just before or as little green buds start sprouting along the old stems). Sometimes, people also cut off all the old messy flowers and wild-looking shoots in fall, which is also fine.) You can prune hard in early spring (and often should, to shape the plant), but if you prune much later, you will delay flowering or prevent it for this year. Another reason (besides improper pruning or insufficient light or soil issues, as a member has suggested) that flowering plants don’t perform can be too much Nitrogen. Are you giving the plant lots of blue liquid or other chemical N? This will prompt lots of leaves at the expense of flowers sometimes (hence my question). Sometimes gardener try to get things to grow faster and end up sacrificing the balance required for flowers to set. I have probably 15 cultivars of the paniculata types here, some quite old, and even in half-shade they will bloom unless these issues arise. Let us know more.
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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.