Perhaps plants do have a healing nature, even without eating them!.

I agree. The very experience of planting them and seeing them grow is therapeutic. I have commented on several post on this topic how frustrated I am that I don't live in a house with land for planting.
I have a small piece of land at the end of the hall that serves as my seed starter and once the plants are big enough to be transplanted I give them away to whoever has land and wants them.
I have mostly fruit trees (tangerines, soursop, sapodilla, among others).
Great post. Good luck with those seeds.