Just as the title says, do any questions regarding the benefits of certain plants or herbs fit in this SE? It seems that this is all about gardening. Should I propose one?
the health and nutritional aspects of fruits/vegetables
are not allowed.
That said, if you've chosen something to grow for those purposes, please feel free to ask the same types of growth and care questions as you would for any other plant.
I've done some research and the closest thing I can find is Health SE. They have nutrition and tea tags, and there may be something there that would help you. I'd suggest having a look at those, or asking in their meta.