Agapanthus leaves turning yellow should always get your attention because it is almost always a sign of trouble. Many people don’t know how to diagnose what the problem is in the first place.

Agapanthus leaves

Continue reading this expert article as we not only tell you how to identify the causes behind this yellowing but also how to solve them.

Why Are My Agapanthus Leaves Turning Yellow?

Agapanthus leaves might be turning yellow as a consequence of getting sunburnt, being overwatered, or when they are suffering from fungal diseases or pest attacks.

The long, curved and slender leaves of the Agapanthus plant turn yellow mostly when they are suffering from an external attack by fungi or pests. Lapses in care such as watering too much or putting them under very harsh sunlight will also produce chlorosis.

Read more about it in the upcoming sections.

– Sunburn

The Agapanthus plant needs at least five to six hours of sunlight each day to grow well. It is quite tolerant of sunlight as a whole. However, this plant can get sunburnt too when exposed to very high levels of sunlight.

The risk of getting a sunburn increases when the weather becomes hot and dry. The leaves turn yellow, crisp and dry. They droop down and in severe cases might even start falling off.

– Overwatering

Overwatering will definitely cause problems with Agapanthus plants. The lower leaves will be affected first, followed by the rest of the plant. These leaves will also be swollen and mushy due to water retention.

This plant needs to be watered only when the top 3 inches of the soil become dry. Watering Agapanthus more than this may lead to overwatering. Overwatering also results from poor drainage. Your soil might be too compact or the drainage hole at the bottom of the pot is not large enough.