Custom-blended Harrell’s Profertilizer® starts with the latest advanced release technologies – some with POLYON® Controlled-Release Fertilizer, followed by up to 175 ingredient options, double and triple-screened for the finest blends. Harrell’s technicians sample every batch and supervise each bag of your order for quality control ensuring the best product. Consistent prill size, Harrell’s Profertilizer® will spread evenly – with no streaking – for consistent growth all season long.