Steve Jackson wrote:
I have a number of these Agapanthus plants in containers on my patio,
and have fed and watered them religiously this summer, having kept them
indoors frost free all last winter, bringing them back outdoors in May.
Several of them are large plants, but none of them have flowered this
year at all - not one single flower stem!

Anyone offer advice on what I may have done wrong please? Are they worth
over-wintering again?

Any help appreciated
--
Steve Jackson
Hatton Park
Warwick

They are always more likely to flower, if they are pot-bound, or
container-bound. Full sun is always best. When over-wintering, it is best to
keep the root system almost completely dry, otherwise the roots might rot. Is
it possible for you to examine the root system, to see if it is healthy? If it
isn't, that might be a reason for not flowering.
Best of luck, John