potassium
Potassium [k] is the third major nutrient that is essential to plant survival. Combined with nitrogen [n] and phosphorus [p], these three are known as the 'macronutrients'. These nutrients are needed in large quantities for plants to flourish. Just as humans need oxygen, protein and carbohydrates to function properly, plants have the same reliance upon the macronutrient group. Along with nitrogen, plants require large amounts of potassium to grow well. Also a major component of photosynthesis, potassium is crucial in a plant's ability to absorb and convert light energy into growth.

Guaranteed Analysis

500 mL bottle w/ locking pump
(treats up to 8,300 gallons)
Price: $14.99