I've grown them in pots before Sue , on my patio; they did fine. Of course, they are limited by the size of the pot so would need a big container. I believe the varieties I grew were Carmencita and the plainer Green Ricinus ( it was some years ago) As I recall, Carmencita did better as it is not quite as large of a plant. Your New Zealand Purple looks very attractive; I love those dark rich leaves and of course they have such a great tropical look to them! I only ever grew Castor Bean in the garden once, it was a monster and I can remember trying to dig up those roots after the frost took it......
I never tried it again,lol.
