Solving Rose Nutrient Problems
Identify common plant nutrition problems by looking at the leaves of your plants. This will help you figure out what your plant needs.
Mature Leaf Sets Affected
If symptoms are localized to mostly mature leaf sets (those on stems already carrying blooms), see which one of the following deficiencies your plant may have.
Leaves lighter green to yellow, with random leaf spots. If soil is too acidic (pH 5.8 or less), apply lime (1/4 to 1/2 cup per bush). If pH is OK, fertilize with high nitrogen fertilizer (1 to 2 tablespoons per bush).
Leaves dark green developing dark red and purple colors, mainly within leaf (colors can also spread to outer edges). If soil is too acidic, apply lime. If pH is OK, fertilize with high-phosphorus fertilizer (20 percent), 1 to 2 tablespoons per bush.
Leaves are light green with lighter-green veins. Apply soil sulfur (2 tablespoons per bush) or apply a fertilizer containing this element.