Agapanthus is tolerant of a fairly wide range of soil pH, but something in the 6.5 to 7 range would be ideal. Use a complete fertilizer product periodically in moderate doses. I like to use a turf type fertilizer with a 3-1-2 ratio of nutrients (such as 15-5-10) at a rate of about a cup per 50 square feet of bed area, applied in spring, early summer and mid summer.
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