Cutting Edge Solutions Uncle John's Blend, 55 galDescription Uncle John's Blend: This is a complex potassium mix which primarily enhances a plant's metabolic rate, especially for flowering plants during the bloom stage. Potassium is a vital component in photosynthetic processes, such as in the creation of ATP (plant sugars) and the distribution of these sugars throughout the plant tissue. The low molecular weight of Uncle John's Blend renders it instantly usable to the plant, as well as creating a