Why Are My Plant's Leaves Turning Yellow? 8 Causes Explained

Yellow leaves are your plant's way of communicating a problem. Learn how to diagnose the cause and fix it before the damage spreads.

Yellowing leaves are one of the most common signals plants send. The tricky part: almost a dozen different problems cause yellow leaves. The pattern and location of yellowing are your best diagnostic clues.

8 Causes and Their Fixes

• Overwatering: Reduce watering frequency; repot in well-draining soil if roots are rotted.
• Underwatering: Check soil moisture; water thoroughly when dry.
• Too little light: Move to a brighter spot or add a grow light.
• Too much direct sun: White-yellow scorching on leaf surfaces — filter with a sheer curtain.
• Nitrogen deficiency: Old leaves yellow first; feed with a balanced liquid fertilizer.
• Temperature stress: Avoid cold drafts and heating vents.
• Natural aging: Lower, oldest leaves yellow and drop — this is completely normal.
• Pests: Spotty yellow patterns signal spider mites or scale — check leaf undersides.

Reading the Pattern

Yellow leaves starting from the bottom = likely aging or overwatering. Yellow leaves starting from the top or new growth = likely nutrient deficiency or temperature issue. Yellow with brown crispy edges = underwatering or low humidity. Patchy yellow with webbing = spider mites.

Take a photo of the affected leaves in GreenPic's AI Health Diagnosis for an instant assessment.

Yellow leaves won't turn green again once the damage is done. Once you've fixed the underlying problem, trim the yellow leaves so the plant redirects energy to healthy new growth.