Uncle John’s Blend SP 4-0-27 combines essential trace micronutrients such as Manganese (Mn), Zinc (Zn), Iron (Fe), and Sulfur (S) along with the essential primary nutrient Potassium (K) to enhance the genetic potential of plants. Uncle John’s Blend SP 4-0-27 is the Soluble Powder(SP) version of the original liquid Uncle John’s Blend. Uncle John’s SP 4-0-27 is recommended as a supplement in all stages of plant growth, but is most critical in the flowering stage for nutrient mobilization and metabolism. Uncle John’s Blend SP 4-0-27 is versatile enough for all types of fertigation systems, including drip irrigation and recirculating hydroponics. It also proves effective as a foliar spray during the vegetative and transition growth phases. Designed to integrate smoothly with all commercial nutrient programs, Uncle John’s Blend SP 4-0-27 ensures comprehensive compatibility and ease of use.