That’s generally true. Geranium plants can become less vigorous during the growing season if nutrients in the potting mix or soil are depleted.
A gentle feeding approach is usually better than heavy fertilization:
- Feed every 2–4 weeks during active growth (spring through early fall).
- Use a balanced, water-soluble fertilizer at half the recommended strength, or a fertilizer formulated for flowering plants.
- Water the soil before applying fertilizer if the soil is very dry.
- Remove spent blooms and yellowing leaves to encourage continued flowering.
- Ensure the plant gets adequate sunlight (typically 4–6+ hours of direct sun daily for best blooming).
If geraniums are slowing down, other causes besides nutrition can include:
- Too little sunlight
- Overwatering or poor drainage
- Heat stress
- Root-bound containers
- Pests or disease
The phrase “wake them back up” is a simplification, but regular light feeding can help support new growth and flowering when nutrient deficiency is part of the problem.
