Newly planted (last two weeks) in a spot which gets full morning and midday sun… against a south-east facing wall ... adjacent plants, also planted at the same time, all happy.
Frazzled by the sun ... hydrangeas prefer semi-shaded spots, particularly until they are established.
Your new plant is likely to have come from a semi-shaded spot in a nursery ... we’ve had high temperatures and very bright sunshine which will have been magnified by the reflective white wall.
“I am not lost, for I know where I am. But however, where I am may be lost.” Winnie the Pooh
When you transplant it to a shady spot, don’t put it close to a wall, it’s going to grow very big and will need lots of water, close to a wall will shade it from the rain. There are a few threads on here at the moment about hydrangeas, you need to bear in mind they grow huge in all directions.
Gardening on the wild, windy west side of Dartmoor.
Agree with all the observations and advice so far. I do think you have planted all your plants too close to one another. In a year’s time, they will be fighting for space. All those plants also need depth as well as width.
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Your new plant is likely to have come from a semi-shaded spot in a nursery ... we’ve had high temperatures and very bright sunshine which will have been magnified by the reflective white wall.
There are a few threads on here at the moment about hydrangeas, you need to bear in mind they grow huge in all directions.