Proceed with Caution (Dilution & Moderation Required)
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Epsom Salt (Magnesium Sulfate — : Delivers readily available magnesium and sulfur, essential for chlorophyll synthesis and enzyme transport (especially in heavy feeders like tomatoes and peppers).
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The Risk: Applying dry Epsom salt directly to indoor container soil creates localized high salinity that burns delicate feeder roots. Always dissolve 1 tablespoon per gallon of water rather than applying dry.
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Spent Coffee Grounds: Contains roughly 2% nitrogen along with trace minerals, acting as a slow-release organic amendment that slightly lowers soil pH for acid-loving flora (e.g., Azaleas, Ferns).
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The Risk: When piled dry on topsoil, coffee grounds dry into a dense, water-repellent (hydrophobic) crust that blocks airflow and traps excess moisture underneath, encouraging mold and fungus gnats.
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Diluted Milk: The proteins and beneficial microorganisms in milk can suppress leaf pathogens like powdery mildew when sprayed onto foliage as a dilute wash (1:9 ratio with water).
