Sulfur is a primary constituent of many amino acids. It aids in the activation of enzymes and vitamins and is needed for chlorophyll formation. It stimulates seed formation and plant growth vigor. It helps maintain dark green color and aids in use of nitrogen.

Sulfur deficiency can lead to increased powdery mildew and higher disease proneness.  It is characterized by leaves that progress from lime green to yellowish. Leaf tips may burn, darken, and turn down. Sulfur deficiency can resemble nitrogen deficiency.

Key Grow Solutions has added sulfur to its White Royal product to ensure that your plants are provided the complete spectrum of macro- and micronutrients.