Plantacote controlled-release fertilizer from X-Calibur Plant Health Co. delivers consistent control of nutrient release over the entire crop cycle. Its tough elastic polymer coating reduces mechanical damage during mixing and ensures crop safety during periods of frost and hot weather. Release time is not affected by substrate type, pH, microorganisms or level of irrigation. Various formulations are available including customized formulations designed to meet specific fertility requirements. Release dates can vary from two to 16 months depending on the fertilizer formualation.