@scobec16 I have no idea to be honest .Are these leaves growing out of an old tree stump maybe. Wouldn't suggest you handle it but is it shrubby and woody or are these stems soft and coming straight out of the ground. One last though are you aware of any flowers?
I have worked as a Gardener for 24 years. My latest garden is a new build garden on heavy clay.
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That could be a good contender
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.