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If they're fairly newly planted I'd just give them some time, plants that don't have their roots well established aren't going to put out a display of huge flowers, and it can take a year or two for them to really get going. If they've been in the ground for years though it would help to know how much water/fertilizer they get. Or it could be your climate--I think Houston's probably on the warm side for hydrangeas to be really, truly happy, so you may never get the kind of blooms that someone in a cooler climate would.