Answer: I don't think you're doing anything wrong. Your agapanthus probably isn't getting exactly the sun exposure that it prefers. If you have it in full sunshine, move it to a site where it will get some afternoon shade; if you have it in a shady spot, move it to where it will get at least some morning sunshine. Agapanthus prefers soil on the slightly moist side and will be happy with a slightly acidic soil pH. Try topdressing with peatmoss and fertilizing with an acidified fertilizer. I think the combination of lowering the soil's pH and giving it a partly sunny exposure will do wonders. I hope so!
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