where can i obtain agapanthus charlotte

What area do you live in?

Try the RHS website and go to the 'Plantfinder' on it. If you type in the plant name, a list of Nurseries will appear - I hope you are successful in finding it..

have you tried Proper plants which have an amazing variety~below are the mail order RHS listed nurseries

Beeches Nursery
EBee
Saffron Walden, Essex,
CB10 2HB

Hoyland Plant Centre
NHoy
Barnsley, Yorkshire,
S74 9PZ

Mac Pennys Nurseries
CMac
Christchurch, Dorset,
BH23 8DB

Pepiniere de l'Ile
XPde
Ile de Brehat, France

Crocus.co.uk can supply it mail order. They do a blue one and a white variety of it also. Good plant quality always guaranteed.

Beg your pardon. Not sure whether you just meant 'Africanus' or a sub-variety of it.