Cutting Edge Solutions Uncle John's Blend QuartProduct Details UNCLE JOHN'S BLEND (UJB) is a complex potassium mixture used primarily to enhance a plant's metabolic rate, especially for flowering plants during the blooming stage. Potassium is a major component in photosynthetic processes, including the production of ATP (plant sugars) and the transfer of those sugars throughout the plant tissue. The low molecular weight of UJB makes it very available to the plant for immediate use, as well as