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Plants have varied needs: Different plants need different amounts of nutrients, water, sunlight, and care. One teaspoon of anything isn’t universally enough for all plants.
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Possibly a concentrated product: If it’s marketed as “just 1 teaspoon,” it’s likely a highly concentrated fertilizer, organic extract, or growth booster. These are usually diluted in water and applied carefully.
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The magic is relative: Even a tiny amount of a potent solution can help some plants, especially potted ones, look healthier, bloom better, or bear fruit—but it’s not a guaranteed miracle for every plant in every condition.
If you want, I can explain what might realistically be in that teaspoon that could actually make plants grow lush and fruitful. That way you’ll know if it’s a gimmick or something that works. Do you want me to do that?