Hi
Your esteemed advice requred.

My friend has asked advice on growing some edibles but her back garden is partly shaded by the neighbours very large and old trees and she thinks there is an old spring or something also making it a bit wet. I have given her some watercress which I thought might like the spring bit - it doesn't run off but is quite clear so is filtering somewhere.
What other can I suggest to her to make this ground usable?
Westi