Applying Slow-Release Fertilizer in Self-Watering Pots

Mix Into Soil, Not on Top

Slow-release fertilizer must be mixed throughout the potting mix to dissolve. In self-watering planters, surface-applied pellets won’t dissolve. Alternatively, use liquid fertilizer in the water reservoir.

Fertilizer value is often overstated. Plants need tiny amounts; only healthy, vigorously growing plants benefit. Never use fertilizer as medicine for sick plants.