Borage has been an excellent companion plant for our vegetable and herb gardens. It attracts beneficial insects, is a useful chop and drop plant and it is beautiful.  In the locations where we grew borage, the garden plants did significantly better.  This post is our first season of growing in soil that was mainly sand with mulch and alfalfa on top. We did add compost, and our other soil conditioners such as humic acid and microbes.