That lack of water is probably the answer, and they look like quite large specimens which is also a factor in getting them established. Hopefully, they can come away for you though, especially if you're heading into more autumnal weather. Rainwater is always better for them unless you have soft water, as we have in the west of Scotland, so it could be worth collecting it in a water butt if you can do that They also benefit from regular mulching with organic matter - compost, leaf mould, or even fine bark. I think you have gravel on the bed, so it could be worth pulling some of that away so that you can add a little bit of goodness to the soil around the base. Even an inch every month or two will be really good for them, as it helps retain moisture, but more importantly - will help the soil, which is the best solution for shrubs.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
Possibly one part of the border is more exposed than the other to wind. That would make the plants and soil dry out faster than the more sheltered side.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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Hopefully, they can come away for you though, especially if you're heading into more autumnal weather. Rainwater is always better for them unless you have soft water, as we have in the west of Scotland, so it could be worth collecting it in a water butt if you can do that
They also benefit from regular mulching with organic matter - compost, leaf mould, or even fine bark. I think you have gravel on the bed, so it could be worth pulling some of that away so that you can add a little bit of goodness to the soil around the base. Even an inch every month or two will be really good for them, as it helps retain moisture, but more importantly - will help the soil, which is the best solution for shrubs.
I live in west central Scotland - not where that photo is...