while bamboo is not medicinal, I feel it can be very spiritual in impact.
Clumping bamboo only. For me a tranquil garden must have water feature, even a small one, and it must have bamboo.
Aloe vera grows very well here, so that's another medicinal plant to have around.
I now have some lavender in a pot, always like to have lavender.
Rosemary, parsley, oregano, thyme, basil -- all do well.
Red ti, green lau lau (ti) and hapu'u fern also add spirit to the garden.
And lilikoi vine is a wonderful plant, for both flowers and fruit.
Bananas, too, are a great presence.
I like pineapples, but it's really hard to weed around them, best to cut holes in plastic and stick them in, or put up with weed-surrounded pineapple like I do. [
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A tree I would recommend is paklan. I planted one three years ago that is now a full tree, gives shade, doesn't drop leaves, has heavenly smelling flowers, and the bugs ignore it. They are not cheap but they're rewarding.
Mmm, which reminds me, a puakenikeni is another one for the spirit.