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Christine, you don't say just how long your agapanthus have been growing or how large the pots are. You will probably have to wait until roots have completely filled the pots. I've had some plants flower in their first year, while others have taken 3 years, so be patient.
Christine I bought a very small pot of agapanthus 3 years ago and put them in a 2 foot pot with lillies and pineapple lillies and top dressed with pebbles the pot is not root bound and this year I have one very large flower for the first time and 3 pineapple lilly flowers the agapanthus has made good broard leaves so hopefully I might get 2 flowers next year.I have freinds who have a clump of them and they don't do anything to them they just garden around them and they get 20 to 30 flower heads a year.