“More” is easy advice to give. It is harder to justify.
A cannabis study in deep-water culture tested different nitrogen, phosphorus and potassium supplies during flowering. Yield responded differently to the three nutrients. Adding potassium across the tested range did not increase flower yield in that experiment.
That does not mean potassium is unnecessary. It means a plant's need and a product's presence on the shelf are different questions. One study in one production setup also cannot become a universal recipe for soil, coco or another cultivar.
Next step: review the complete nutrient supply before stacking a flowering supplement on top. Know what the base feed already contributes and what question the extra input is meant to answer.
Reviewed 8 October 2026