Arum lily / Zantedeschi growing conditions
I've just started gardening for a couple of ladies, and one of them wants to grow arum lilies in her border. She's bought them from the garden centre and they are just labelled as a generic 'zantedeschia'. According to the RHS zantedeschia should be grown in water, but other sites and forums say they can grow in the ground. I've no experience with these - how can I best grow them to flower and do well - and how big will they get?? Thank you for any advice. The border she wants them in is east facing on clay.