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Half a viburnum not flourishing

I would like advice about my viburnum please.
We planted this mature bush last December and it seems to have settled in well - one part of it at least. As you can see, on side (all connected to the same branch) is rather bare - the flowers did not open and the leaves are also slow to emerge. I scratched under the bark and it looks healthy and green. Is it just a question of one side getting less light? Could it be a disease and if so, should I wait and see before removing the branch?
We planted this mature bush last December and it seems to have settled in well - one part of it at least. As you can see, on side (all connected to the same branch) is rather bare - the flowers did not open and the leaves are also slow to emerge. I scratched under the bark and it looks healthy and green. Is it just a question of one side getting less light? Could it be a disease and if so, should I wait and see before removing the branch?

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I wonder if it's been a bit short of water where it is, and the root's therefore struggling to support the whole shrub. It's a big specimen, which is always a bit more difficult to establish. It's often very dry at the foot of walls too, so it could be a bit dry in the site it's in. If that's the case, a good watering and some mulching is often enough to make them happy.
What's it like at the base?
I live in west central Scotland - not where that photo is...
It's an Anne Russell. Good point on water - we've planted it some distance away from the wall but I'll be prodding the soil to be sure. And topping up the mulch. I figured though that lack of water should affect the whole bush rather than just one side.
I'll try and post another photo of the base
In the sticks near Peterborough
I don't know if it would help to take that bit off, but since the other part is fine just now, it might be better to wait and see. It's not been in long too, so it's worth giving it a bit of time.
I live in west central Scotland - not where that photo is...
In the sticks near Peterborough
The shrub was dragged around a bit when we planted it (it was so heavy) so that might have damaged the roots on one side.
You'll also see the burlap and wire basket poking out of the soil - I was told to leave that to protect the roots.
In the sticks near Peterborough