I have found that some kales grow well in shade, Asturian kale and wild kale in particular. The Asturian kale is relatively small, the wild kale is the opposite, tall and strong, but both of these manage not to falll over. Other kales I have tried do tend to get thick and heavy stems and then they get top heavy and start leaning too much.
Sweet cicely grows in shade of the hedge you can use the leaves as a sweetener and eat the young seeds but its not a main vegetable. It has early flowers though that are good for pollinators. I believe you can eat the
roots and I am growing some to try but have not pulled them yet.
I have one skirret plant growing in the hedge as well, it is a good size, equal to those growing in sun, but I have not dug it to see what's below ground.
Mashua is growing up the hedge and has gone mad with growth up through a tree, again it's not harvested so I don't know what's below ground.
I am growing runner beans and french beans up the hedge on the sunny and shady sides. They have done reasonably well but I got them off to a slow start and they could have been better.
I also have field beans, Jerusalem artichokes,
land cress adjacent to the hedge. Land cress particularly likes this situation.
Blackcurrants have grown well in my garden in pretty deep shade. Josta berries have been in partial shade and done well. Gooseberry is good in shade as well. Raspberries also good, cultivated blackberries less good which is odd given that brambles thrive in that situation.
The very earliest onions - three cornered leek, few flowered leek and wild garlic also grow against hedges and under trees that have not yet come into leaf. Other onions I have tried (Welsh onion, tree onion, shallots, spring onions) have grown in shade but generally not very prolifically so I try to give them the sunniest spots I can.
Anni