Ever wonder why plants need Potassium? Well here’s one absolutely crucial role of Potassium: Potassium (K+) Regulates Stomatal Opening and Closure. Stomata are small pores located on the underside of leaves, which allow the plant to exchange gases with the environment. Principally the stomata allow the plant to uptake C02 for photosynthesis and let out oxygen and water, cooling our planet and replenishing our oxygen supply; not to mention allowing the plant to grow! So remember to give your plants plenty of Potassium!
For more on what Potassium does in the plant body check out this link: http://horticentar.mk/en/potassium-k/