Answer: I wish there were an easier way to recommend, but Agapanthus really needs moderate temperatures to survive the winter and leaving yours outdoors, no matter what kinds of protection you try to provide, simply won't work with these plants. In terms of general container care, the plants prefer a rich but well-drained soil mix and moderate to bright light indoors. During the winter when growth is slow they should be watered lightly -- just enough to keep the soil from going dry and grown on the cool side. Ideally, they appreciate cooler temperatures at night say 50 to 55 degrees and cool days of perhaps 65 degrees. During the summer, however, the plants need copious amounts of water and seem to do best when somewhat pot-bound. I'd leave them in containers and sink the containers into the ground outdoors in spring and summer, then lift them and set them indoors over the fall and winter months.
They are such pretty plants, I think they're worth the extra effort. Enjoy!
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