That sounds like a riddle or a metaphor rather than a literal gardening tip. Literally, no single teaspoon of a substance can guarantee every plant will thrive—it depends on soil, water, sunlight, and plant type.
But in the context of riddles or sayings, the answer is likely something symbolic that “nourishes” all plants in a tiny amount. Common answers to this type of riddle include:
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Water – even a small amount can revive a thirsty plant.
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Love or care – a metaphorical answer; attention and care help any plant grow.
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Sunlight – essential for all plants, and even a little sunlight helps them.
If you want, I can narrow it down to the most likely intended answer based on traditional riddles. Do you want me to do that?
