Does anybody know what kind of hydrangea this is? Blooms big white flowers. I live in Iowa, the plants were bought in Minnesota. I think it's a hydrangea, but need one more and cannot one similar.
looks like one of the tardiva
But the bloom is round...not long/cone shaped like I find when I search tardiva.
It's a paniculata variety, but we wouldn't be able to tell which because you didn't post a pic of the blooms.
But as a general rule, popular varieties would go as such:
Grandiflora - blooms go from pure white to pink
Limelight - blooms go from greenish creamy white to pink
Since it produces a mop-head flower and is not red-stemmed plant, that rules out a bunch.