Hi Emma Jane - I say, nothing ventured, nothing gained. Last year, I allowed the grass under my (one) apple tree to grow long, and any wild flowers to grow naturally, and there were a few. I found some nasutium seeds, and scattered those too, and a few grew. I was also hoping that any nasturtums would attract the "woolly aphid moth" away from the apple tree.
I had a chair under the tree, and it was lovely to sit there when t got too hot, and Annie found the long grass a welcome place to stretch out and keep cool.
Let us know (in due course) how you got on. I allow stinging nettles to grow along the back fence for the butterflies - do you do something similar?