Sun Gro Horticulture 1410602.Q08P Black Gold Cactus Mix (8 qt) Sun Gro "Black Gold Cactus Mix" has been specifically blended to suit the unique growing needs of all cactus and succulents No additives are needed This special mixture consists of volcanic pumice, perlite, sand and forest humus- - not too rich, but just right Sun Gro "Black Gold Cactus Mix" has been specifically blended to suit the unique growing needs of all cactus and succulents This special mixture consists of volcanic pumice, perlite, sand and forest humus- - not too rich, but just right