Sulfur is a necessary plant nutrient, and it has many uses in the garden. Sulfur deficiency can appear as yellowing of younger leaves and stunted growth. To remedy sulfur deficiency, a small amount of sulfur powder can be mixed into the soil. This can also acidify and decrease the sodium content of the soil.
Sulfur powder can also be dusted on the leaves and stems of plants to act as a natural fungicide and pesticide.