I have very acid soil so mine are all blue, except the white ones and a Vanilla Fraise.
The fertile flowerlets of the white ones go blue. It makes the inflorescence look even bluer.
Use commercial Hydrangea Bluer, or Alum/aluminium sulphate. The latter, BTW, is used to treat drinking water. It also is useful in improving the drainage of clay soil.
location: Surrey Hills, England, ex-woodland acidic sand. "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
This one is a lace cap, too big for its boots, it will have its big cut down in the Spring I may chance doing it now, we seen to be having warmer winters.
Gardening on the wild, windy west side of Dartmoor.
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Use commercial Hydrangea Bluer, or Alum/aluminium sulphate. The latter, BTW, is used to treat drinking water. It also is useful in improving the drainage of clay soil.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
Here's a bluer one.
Actually, looking at the one from @Lyn this may be the very same place. I wonder?🤔
This one is at Goodnestone Park Gardens in Kent.
Sigh!
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
Sorry bédé no idea.
I may chance doing it now, we seen to be having warmer winters.