So we’ve eliminated light (as one’s in sun) and you are within its Zone hardiness (they are the hardiest of hydrangeas, down to Zone 3, I believe, brrrrrr). I’d recommend the soil test, and especially no more fertilizer that could be tipping things in the favor of foliage-only. If there is lawn nearby that is being fed, leached N from that can also be a culprit. We will await the results inquisitively…
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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.