That headline is catchy  — but there isn’t a magic single “1 cup” cure. Peace lilies (Spathiphyllum) bloom based on light, nutrients, and overall care.

That said, here’s what people usually mean — and what actually works:

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 The Most Effective “1 Cup” Method (That’s Legit)

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 Diluted Liquid Fertilizer

If your plant is healthy but not blooming, it may just need nutrients.

How to do it properly:

• Use a balanced liquid houseplant fertilizer (10-10-10 or 20-20-20)
• Dilute to half strength
• Apply about 1 cup of the diluted solution
• Feed every 6–8 weeks in spring and summer

Too much fertilizer = lots of leaves, few flowers.

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 The Real Secret: Light