TeraVita Hum-Amend B is a powerful high-carbon soil restoration amendment plus valuble Boron. It is suitable for use on any soil or in any soil-less potting mix. At 5-lbs per 1,000 square feet it delivers 1 pound of Boron per acre and at 10-lbs per 1,000 square feet it delivers 2 pounds of Boron per acre.