Geranium leaves turn yellow mainly due to several common causes:
- Overwatering: Geraniums prefer drier soils; too much water or poor drainage causes yellowing leaves at the bottom and may lead to root problems.
- Underwatering: Though drought-tolerant, extended dry spells can turn leaf edges and tips yellow.
- Nutrient deficiencies: Especially lack of nitrogen, magnesium, or iron can cause yellow leaves due to impaired chlorophyll production.
- Lack of sunlight: Geraniums need about six hours of sunlight daily; insufficient light reduces chlorophyll and causes yellowing.
- Cold weather: Cool or wet conditions, or sudden cold snaps, can lead to yellow leaves, with recovery when warmer conditions return.
- Pests and diseases: Infections or infestations may cause yellowing accompanied by other symptoms like spots or wilting.
Checking soil moisture, ensuring proper drainage, providing adequate sunlight, fertilizing appropriately, and protecting from cold are key to resolving yellow leaves on geraniums.
