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Ten, 15 and 20 percent appear as percentages of nitrogen in houseplant fertilizers. Clemson University extension publications suggest such balanced percentages of nitrogen, phosphorus and potassium (NPK) fertilizers as 10-10-10 and 20-20-20 for houseplants grown for their foliage. They tend toward 15-30-15 NPK percentages for houseplants grown for their flowers.

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Q: What percentage of the fertilizer is nitrogen in the houseplant fertilizer?
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