What Is The Npk Of Borage?

Question

I am looking for a plant that will provide me with nitrogen and basically no phosphorus or potassium. Our natural soil here has a high concentration of both.

Answer 1

Borage will add nitrogen to the soil if tilled back into the soil in the fall.

https://www.gardeningknowhow.com/edible/herbs/borage/using-borage-as-green-manure.htm