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Ah, I answered your other thread.
They like to be pot bound and do best in a really sunny spot and soil that is not too rich. Water them only when the soil is dry.
There are varieties that are hardier than others.
We moved here recently and it's the first time in years that I've had a garden sunny enough to grow them, so I planted some in a pot last year - they've overwintered in a sheltered spot and are just sending up green shoots so at least they're still alive
Dove-we recently had a discussion about Agapanthus and I can't remember who said that they spoke to a grower who said it wasn't necessary to restrict them, so it seems there is a fair bit of conflicting info on that. I tried some years ago and they didn't flower (just leaves)after I'd kept them restricted so it put me off buying them again. I can't remenber what the thread was but someone will no doubt reply here.
I just found the thread re the agapanthus. It's '2 plants for 2 large pots' (sorry I've already forgotten who posted it ). Gives a bit of interesting info about them. Seems the usual advice we hear about restricting roots isn't necessary!
Adam Pascoe seems to think they need to be kept potted a bit tight http://www.gardenersworld.com/blogs/plants/agapanthus/2826.html
and I think this is the thread you mean Fairygirl http://www.gardenersworld.com/forum/problem-solving/agapanthus/5840.html but I can't find where it says the roots don't need restricting