We offer both plastic and pulp containers. While plastic is not sustainable, we continue to offer them due to customer demand. Our Pulp Containers are made of molded cellulose fiber derived from peat, compost cow manure or 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.