Obviously with me in Zone 5 b, the growing conditions are a world apart.
Mine go outdoors after Mother's day and come in by ~ October 15th or so. Like ALL the other freaking Tropicals I have. hehe
Over 30 years, with 3 pots and 3 types of Agapanthus, we have seen maybe 10 blooms total. Good thing they are pretty to look at. Better thing they belong to my wife. heh
I must admit that last year I planted 2 rhizomes myself and tried to sell them at the farmers market where I am a vendor. No sales last year. None this year either. This year in my nursery area, I said WTH is that blooming. Forgot about it. It was blooming!! So I put it on the Deck. Hummer liked it