Answer: Spring and summer are the usual growing times for agapanthus so I'd replant them now, either in the ground or in containers.
In your gardening region the plant roots should be dug at the end of the season and stored in sand in a cool, frost-free location until replanted the following spring. Agapanthus grows equally well in full sun or partial shade, in rich, loamy soil. The plants require regular, deep soaking during the growing season.
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