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Slice the onion and place it in a bowl or jar.
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Pour in the water and let it steep overnight (8–12 hours).
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Strain the liquid to remove any solids.
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Use the strained onion water to water your anthurium.
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This diluted form of onion infusion gives your plant a nutrient-rich drink while also helping deter pests such as gnats and fungal infections. Use this treatment every 2–3 weeks for best results.
Additional Benefits
Besides improving flowering, onion-based treatments offer other bonuses:
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Improved root health: Sulfur helps prevent root rot and bacterial infections.
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Pest resistance: The natural compounds in onions repel aphids, fungus gnats, and other common indoor pests.
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Fungal prevention: Helps protect your plant against soil-borne fungi and mold.
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Anthuriums, like many tropical plants, are vulnerable to root problems when overwatered or grown in heavy, non-draining soils. Onion’s antimicrobial properties make it especially useful in these conditions.
Tips for Success
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Use fresh onions: Avoid moldy or sprouting ones, as these could introduce unwanted pathogens.
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Don’t overuse: One slice or treatment every month is enough. Too much onion can make the soil too acidic or disrupt the plant’s microbiome.
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Ensure proper drainage: Onion slices work best when your potting soil drains well and the plant isn’t sitting in moisture.
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Monitor your plant: After applying the treatment, watch how your anthurium responds. You should begin to notice brighter foliage and the appearance of flower spikes within a few weeks.
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Final Thoughts
It might seem unusual at first, but using onion slices as a natural fertilizer and pest deterrent is an easy, affordable, and highly effective way to support the growth and flowering of your anthuriums. Whether you’re a new plant parent or an experienced gardener, this kitchen-to-garden hack is well worth trying.
Give your plant a gentle boost—no chemicals, no expensive products, just the power of a humble onion. With a little consistency and care, you’ll enjoy lush leaves and vibrant blooms all year long.