If I EVER get my veggie/herb garden to the point I'm happy with it ... and it's no where NEAR that point now ... I want to put in a Witches' Garden.
This wouldn't be a happy healing/culinary herb garden. This would be a nice traditional baneful garden. It would feature poisons and other oddities - deadly hemlock, deadly nightshade, maybe poison ivy (tho usually that's easy enough to find growing around here!), pokeweed, mugwort, wormwood, foxglove, lily of the valley, yews, may apples .... I might even grow abortifacients like pennyroyal in that garden.
Yes, some of them can be used medically. But they can also harm folks.
Just ... because.