Thanks for writing. In your Zone there aren't a lot of plants that thrive in dry shade -- especially that get more than a couple of feet tall.
Larger varieties of hosta may grow well if you keep them watered the first couple of months after you plant them to help them become established. Likewise, daylilies should also grow well (but may not bloom much because of the shade). Comfrey (Symphytum) is another candidate that should do all right in very dry shade.
Learn more about these plants in our Plant Encyclopedia here on BHG.com!
---Justin, Senior Garden Editor, BHG.com