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Basil: An Herb Society of America GuideIndoor CultivationFertilizerWhen it comes to fertilizer, basil requires nitrogen, potassium and phosphate. Many sources recommend fish emulsion, an organic fertilizer (24, 62, 84). Susan Belsinger suggests kelp, added every 7-10 days, or every 3 weeks if plants are still in flats (8). James Adams uses a half strength 10-10-10 solution twice as often as package directions suggest and points out that a solution with high nitrogen is good for promoting leaf growth (1). Mark Langan also likes high nitrogen fertilizers, especially dry mixes that can be added to potting mix (51). He prefers organic fertilizers and locally made composted manure-based fertilizers. Madalene Hill and Gwen Barclay like to fertilize weekly using a half strength 14-14-14 liquid fertilizer "once seedlings have two sets of true leaves" (45). They prefer a balanced fertilizer and believe that although high nitrogen fertilizer produces larger leaves, it can compromise the flavor (45).
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