Hoffman Charcoal Soil Conditioner Catalog Soil & Mulch Hoffman Charcoal Soil Conditioner Manufacturer : Hoffman A H Inc | Good Earth Model Number : 071605175028 Description Improves drainage and absorbs impurities Horticultural charcoal is an additional item recommended by garden writers for custom mixing potting Will not burn releases nitrogen slowly, feeding plants over a long period of time, pelletized for easy application Rates Please contact us for current pricing and availability.