New petunias in window boxes with cocoa liners and Miracle-Gro soil (which already contains fertilizer) likely suffered from fertilizer burn when more slow-release pellets were added. Metal boxes must have drainage holes. Water deeply after planting, then wait until soil feels dry 2 inches down. Don’t pack soil. Morning sun (8 AM–12 PM) means morning watering is fine.
Don’t use liquid fertilizer for 6–8 weeks. Deadhead non-Supertunia/Wave varieties by snipping the stem below the spent flower.
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