I have several cultivars of hydrangea I bought last year. They're all true-to-expectations except one. I bought this one as 'Mounds of Snow,' supposedly a mophead-type that stays white regardless of soil composition. Instead, I've got a lacecap-type that's light pink. One distinguishing characteristic of this one is that the stems are red in color. I wanted to think it was hybridized with Annabelle - since it was supposed to stay white - but now I have no idea.
That's a thought, for sure, pirl. Thanks for the reply. I didn't put it in the ground - just in a larger pot - until it gets better established, because I bought it as a small starter plant. It's very possible the potting soil turned it pink because I've got others in pots that are light pink, also...cuttings I rooted from other plants, in the same potting soil. When I think back to ordering this, I was skeptical of any macrophylla that "stays white." Maybe I'll find a true Annabelle / arborescens this year to try, because I don't have any whites. I enjoy adding to a collection. Others I grow are Glowing Embers, Cardinal Red, Emile Moulliere, Nikko Blue, and Mariesii Variegated. I'd love to try PeeGee's, but I don't get enough sunlight. Regardless, I'm still happy with any new hydrangea. :o)
I don't have Annabelle only because around here they flop so much and look so dreadful after a rain. They do remain white. You could try Limelight, which starts off a greenish white and then turns white.
It's so easy to love hydrangeas!
Here's my favorite one, Beni Gaku, along with two photos of Limelight, a gift from a friend.
A lot of "white" macrophyllas are actually very pale pink or very pale blue depending on your soil pH (will often look fairly white from a distance, but if you look close you'll see the pink or blue tinge). But since Mounds of Snow is a mophead and yours is clearly a lacecap it was definitely mislabeled.