Laurel not growing right...

Hi, new here, first post.
I moved house May last year andat the time our front lawn was not enclosed. As a result we had cars turning around over it.
To remedy this I put in a low wire fence and planted laurel around the perimeter. This was last November.
The problem is, they don't appear to be growing right. Most of them haven't gained much height at all, and have yellowing leaves. This is with the exception of a couple at the top of our lawn, higher up; they appear to be doing pretty well.
I hadn't planned on planting anything last year so didn't get the chance to dig around. But the soil here is very clay heavy. As in, about a foot down you're pulling out chunks of clay.
My guesses are that perhaps the ground is too poorly drained at present, or the roots take longer to push through the clay to develop, or that the surrounding grass is taking up the good stuff from the soil.
It's a shame I didn't know of the issue before planting, but now I'm looking for remedies.
The tip photo below is of the poor growing plants. The bottom is the healthy ones.
Any and all suggestions appreciated. Thanks in advance
I moved house May last year andat the time our front lawn was not enclosed. As a result we had cars turning around over it.
To remedy this I put in a low wire fence and planted laurel around the perimeter. This was last November.
The problem is, they don't appear to be growing right. Most of them haven't gained much height at all, and have yellowing leaves. This is with the exception of a couple at the top of our lawn, higher up; they appear to be doing pretty well.
I hadn't planned on planting anything last year so didn't get the chance to dig around. But the soil here is very clay heavy. As in, about a foot down you're pulling out chunks of clay.
My guesses are that perhaps the ground is too poorly drained at present, or the roots take longer to push through the clay to develop, or that the surrounding grass is taking up the good stuff from the soil.
It's a shame I didn't know of the issue before planting, but now I'm looking for remedies.
The tip photo below is of the poor growing plants. The bottom is the healthy ones.
Any and all suggestions appreciated. Thanks in advance


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Posts
Clear all the grass from along the hedge. Cut them back by a third in height. Feed and mulch with compost well rotted manure of bags of soil conditioner so the worms can take organic matter down into the soil which will improve the clay.
Then read this thread from the beginning ... https://forum.gardenersworld.com/discussion/656523/help-needed-please-with-laurel-hedge-issues/p1
When you’ve read it all you’ll know all there is to know about growing a fantastic laurel hedge. 😊
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.