Answer: I'm as puzzled as you are. Midnight Storm Agapanthus is a hybrid and the flowers should remain true blue. It is possible that the plants seeded the area and then died off, leaving their offspring behind, which are blooming in a different color. This is common in stands of irises and other hybrid plants. The hybrids die off and the stronger species take over, changing a colorful iris bed into the standard purple species. It's quite a disappointment, but it does happen. Hope this sheds some light on one possible cause!
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