That does seem odd. It isn't a stem coming from that other shrub is it?
Other than that, maybe it is just a flower that hasn't developed properly - a bit like when you get fasciation. If it was a grafted plant [unlikely on hydrangeas] it could have been a stem from below that, which is therefore not the grafted plant. Do you know if that's a possibility?
I don't grow these ones, but someone else might have another answer
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
No , the other one is a couple of meters away. And if I follow the branch down if joins with a branch which has a mophead bloom, and well above the ground. I will keep an eye on it to see if it develops into a mophead bloom, but doesn't look like it is going to
If I hadn't read this thread I probably wouldn't have taken any notice of my hydrangea. In one area of my allotment (garden) I have two established hydrangeas probably at least three years and were established when planted rescued from somewhere. They are both mopheads, one pink and one blue. Looking at the pink one today you would say it was a lacecap as each bloom only has the flowers on the outer rim and no sign of it changing. At first I thought it may have been lacking water at some point in the summer which had caused the plant not to flower properly but the blue one is fine. Unfortunately I can't get a photo at the moment but possibly in the next few days. Maybe as @Fairygirl says it hasn't fully matured yet so will keep an eye on it.
Interesting. Mine only has one bloom that looks like a lacecap in amongst all the mopheads. If all the blooms had developed like lacecaps I probably would never have noticed
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I live in west central Scotland - not where that photo is...
Other than that, maybe it is just a flower that hasn't developed properly - a bit like when you get fasciation.
If it was a grafted plant [unlikely on hydrangeas] it could have been a stem from below that, which is therefore not the grafted plant. Do you know if that's a possibility?
I don't grow these ones, but someone else might have another answer
I live in west central Scotland - not where that photo is...
In one area of my allotment (garden) I have two established hydrangeas probably at least three years and were established when planted rescued from somewhere.
They are both mopheads, one pink and one blue. Looking at the pink one today you would say it was a lacecap as each bloom only has the flowers on the outer rim and no sign of it changing. At first I thought it may have been lacking water at some point in the summer which had caused the plant not to flower properly but the blue one is fine. Unfortunately I can't get a photo at the moment but possibly in the next few days. Maybe as @Fairygirl says it hasn't fully matured yet so will keep an eye on it.