We've talked a bit about borage before, but it's a beautiful and delicious plant, and deserves a revisit! It's not only a great companion plant, but it's a useful one to herbalists.
Borago officinalis is a cooling and moistening relative of comfrey. This is important information to remember. We actually don't have that many moistening herbs. It's a short list and borage is on it!
Though borage isn't used as frequently today as it was in the past, I believe its benefits are still extremely relevant, considering we tend to burn ourselves out with expectations that are too high and going at a non-stop breakneck pace.
Here's a video on the basics of growing borage and how to incorporate it into a permaculture system: