Black plastic pots are perfect for perennials and to pot up cuttings and bulbs. Handy to have on hand. We offer both plastic and pulp containers. While plastic is not sustainable, we continue to offer them due to customer demand. Our new Pulp Containers are made of molded cellulose fiber derived from recycled newspaper and have over 50 times the insulation value of the plastic container and protect against both heat and cold; biodegradable, they may be planted pot-and-all to protect delicate roots and reduce transplant shock; simply remove pot bottom, slit sides and tear off rim and plant.