I’m growing Rhodiola, a plant native to Siberia, that did much better than I expected. It doesn’t look like it would be cold hardy but it came back this year after planting it last year. It’s also called golden root and it’s roots are said to have medicinal properties, reducing stress and giving mental and physical vitality. I haven’t tried it yet but in the health food store you can find rhodiola teas and supplements. Interesting and pretty plant.