If symptoms are localized to emerging foliage, use this page to determine the cause and treatment of the problem. Shown at right is an example of healthy emerging foliage, with normally purplish leaves on stems that do not yet have mature blooms.
Calcium Deficiency: Young leaves are hooked. Apply calcium nitrate (1 to 2 tablespoons per bush per week) until corrected.
Boron Deficiency: Young leaves are light green at base and twisted. Apply 1 teaspoon Borax per bush.
Copper Deficiency: Young leaves are permanently wilted with no chlorosis (yellowing). Apply copper sulfate (1/4 teaspoon per bush).
Sulfur Deficiency: Leaves are light green with lighter-green veins. Apply soil sulfur (2 tablespoons per bush) or apply a fertilizer containing this element.
Iron Deficiency: Leave are yellow with principal veins light green. Use iron chelate (1/4 teaspoon per bush) for immediate correction. Iron sulfate takes longer to act.