Why are my sunflower leaves turning yellow?

Yellow leaves on sunflowers indicate underlying issues that require attention. Overwatering or nutrient deficiency are common culprits. Natural aging occurs in lower leaves, but systemic yellowing is a symptom of more concerning problems. Early diagnosis will prevent undue stress on the plant. I check on my plants daily during the growing season.

Avoid yellow leafy greens by practicing good cultural practices with your crops. Grow in amended, well-drained soil with compost. Water when the top inch of soil feels dry to the touch. Apply slow-release fertilizer at the time of planting. Space plants for airflow. These practices will help maintain bright green leaves.

A pest infestation should be handled immediately upon discovery. Spray aphids early in the morning with strong water jets. Treat spider mites with neem oil. Use ladybugs and lacewings as natural predators. Avoid using broad-spectrum pesticides that can harm beneficial insects. Regular monitoring will help detect problems before they escalate.

It is essential to distinguish between natural aging and undesirable discoloration, such as yellowing. Typically, lower leaves will yellow and drop as the plants continue to grow. This is a typical example of energy shifting to new growth. Only be concerned if the upper leaves of the plant yellow, or if multiple plants demonstrate the same symptom. A healthy plant will hold on to its green upper foliage through this entire growth stage.

Read the full article: When to Plant Sunflowers: Full Guide