Year before last, I bought two pots of agapanthus and planted out. Last summer, only one had a single bloom. I've read not to disturb them, but they weren't all that happy, so I dug, divided and replanted, with the help of Buffie, my able assistant, who pulled them up twice.
Instead of two single clumps, they're now 2 groups of three each. Some little pieces off the side went into a pot to grow on.
I'm trying not to plant out things, in case of frost. Only a week until our 'last frost date' but a week plus a month until the last date I've seen killing frosts. The urge to move things out and into the ground is very strong.