Welcome, Mike. Hydrangeas are a national favorite, I think, and I know lots of people wonder how to get them to perform at their peak. You are right, too much Nitrogen can promote green, not flowers, in any plant, including these. This often is the answer when people ask why their hydrangeas look so robust but aren’t blooming–often they’re sited next to the lawn, which is getting nuked by the lawncare company with high-N fertilizer (and so are the hydrangeas). Too little sun can also reduce overall vigor and bloom, and yours sound like they are borderline in that regard–east-facing and merely morning sun. That can in fact reduce bloom a bit, and make an overall looser-looking shrub. I cannot tell from an email, of course, just how much or little light they are getting. Now as for size, remember that ‘Endless Summer’ is a compact variety–like 4 feet or so–and not as big as, say, ‘Nikko Blue’ or other more common kinds that are more like 6 feet. It just isn’t going to be statuesque…but it does bloom, well, endlessly. I suggest a balanced shrub fertilizer that is all-natural and organic, applied late winter or early spring, and continuing to water well and apply a layer of compost as you have been. 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.