Goggle says borage is a dynamic accumulator and I'm kind of surprised: it's a pretty wimpy annual with shallow
roots. It seeds like crazy and insects adore it.
I've got plenty of ex-lawn, which is now a healthy plant community and the borage is semi-restricted to there and under the fruit
trees.
My garden space is way too valuble to fill up with giant, flopping borage plants!
I don't have chooks, but if I know they enjoy it. The flowers,. blue and white, are pretty and edible but I wouldn't want to eat the leaves, like comfrey they're prickly/furry and I've got plenty of other things to eat!