Approximately 2 cubic gallons of ecoGeeks, Three Birds™ Terra Preta BioChar is a perfect size for transplanting projects, indoor plantings, seed starting and small garden projects. Treats between 1.5 and 3 cubic feet of soil (two to four standard bags of topsoil)
Comes in a 10X8X6" shipping box
For best results, mix with compost or other source of soil nutrients for up to two weeks before use to ‘charge’ the biochar