I had new beds dug in last year and filled with top soil that looks like wet you have. The first things I planted were lavender and they have been doing very well. I am sure yours will be very happy - though are I say I think yours are planted a little too close?
Thanks for that @SophieK...and you're right, I always end up planting things too close, and always end up having to move them later...it's my eagerness and impatience to fill gaps quickly.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.