When your plants are well cared for, but don't have that usual glow, they might be suffering from a manganese deficiency. FoxFarm Bush Doctor Manganese Micro-Nutrient can help! Manganese plays an important role in photosynthesis and helps plants defend themselves against environmental stresses. Use at the first sign of deficiency and repeat every other week until recovered. OMRI Listed and Registered CDFA Organic Input Material. 1 - 0 - 0 (1 nitrogen - 0 phosphorus - 0 potassium). 1 liquid pint. Always read and follow label directions.