Bean Stalk K-BOOST controlled release fertilizer to boost potassium - 50 lb pailBeanstalk Controlled Release Fertilizers Beanstalk Controlled Release Fertilizer (CRF) provides a gradual release of nutrients that automatically and intelligently matches a plant's growth cycle. Although this product is not organic, the CRF technology eliminates many environmental issues associated with most conventional fertilizers. The coating on Beanstalk CRF keeps the fertilizer from rapidly dissolving in soil, greatly reducing the potential for