I do love white flowers; it's an unaccountable thing.
Knowing that the Agapanthus will eventually have to go, I began by removing the blue ones, but one day, the white ones will too.
The bargain I have made with myself is that I will take them out when there is sufficient adjacent, replacement cover for the small creatures, that they so effectively protect and provide for.
In the meantime, they are just beginning to flower again and birds are making the most of their bounty.
The Eastern Spinebills (Acanthorhynchus tenuirstris) make great use of them.