Geraniums (Pelargonium spp.) are sun-loving plants, but their light needs vary depending on the species and environmental conditions. Generally, they thrive in 6-8 hours of bright, indirect sunlight daily. However, too much or too little light can cause visible stress. Observing your geranium's physical cues is key to adjusting its light exposure.
2.1 Leggy Growth: If stems become elongated with widely spaced leaves, the plant is stretching toward light (etiolation). This weakens the structure and reduces flowering.
2.2 Pale or Yellowing Leaves: Chlorosis (loss of green pigment) indicates insufficient photosynthesis due to low light. New leaves may appear smaller and lighter.
2.3 Reduced Flowering: Geraniums prioritize survival in low light, diverting energy from blooms. Fewer or no flowers signal inadequate light.
2.4 Leaf Drop: Lower leaves may yellow and fall as the plant conserves energy for top growth.
3.1 Scorched Leaves: Brown, crispy edges or bleached patches on leaves indicate sunburn from intense direct sunlight (common in hot climates or south-facing windows).
3.2 Wilting Despite Moist Soil: Excessive light raises leaf temperature, accelerating water loss. Leaves may droop even if soil is damp.
3.3 Red or Purple Tints: While some geranium varieties naturally have reddish foliage, unnatural reddening (especially on leaf edges) can signal light stress.
3.4 Stunted Growth: Harsh light may cause compact, brittle growth as the plant struggles to retain moisture.
4.1 For Low-Light Stress: Move the plant to a brighter location (east/west-facing windows) or supplement with grow lights (12-14 hours/day). Rotate the pot weekly for even exposure.
4.2 For High-Light Stress: Filter intense sunlight with sheer curtains or relocate to dappled shade. Outdoor geraniums benefit from afternoon shade in hot regions.
4.3 Seasonal Adjustments: In winter, geraniums may need closer proximity to windows. In summer, protect them from midday sun.
5.1 Acclimatize Gradually: Sudden light changes shock plants. Transition geraniums over 7-10 days by incrementally increasing/decreasing exposure.
5.2 Monitor Soil Moisture: High light increases water needs, while low light risks overwatering. Adjust watering based on light conditions.
5.3 Prune Damaged Foliage: Remove scorched or leggy stems to redirect energy to healthy growth.
