There are many varieties available nowadays in various colours with spotted leaves, but if the one you saw was pure white with plain green leaves, it will have been Zantedeschia aethiopica 'Crowborough', which is hardy outside. It will grow in a pond, or in the ground where it prefers damp soil, or at least soil that doesn't dry out frequently. It also likes sun, so that's probably why you don't see it as a border plant that often - sunny positions are often dry, but if the ground is shaded by a low wall or something, and the top is in the sun, that works quite well.

Thanks Bamboo. The ones that are in different colours are normally Canna Lillies but you're right about Crowborough!!
Still interested in members views on such a brilliant white colour in the garden.

Not Canna, Greencab, that's a totally different plant and Canna is its Latin and common name. Some people call Zantedeschia calla lily though, some say arum, but they're neither really. The coloured forms of Zantedeschia are sometimes named, but otherwise are just called Zantedeschia hybrids.

Ops...what can I say?? Sorry i'm in the 'some people' group, haha.

That's fine, Greencab , not a criticism - but calla is what you want to call it, not Canna (look up Canna, you'll see what they are....)

I have several clumps of Arum lilies growing in my garden. One is in a relatively shady spot that can be a bit on the damp side, and near a copper beech tree and a wall. I have others growing in various different places in the garden and all are doing really well. They are a beautiful contrast to the other plants growing there. My whole garden is a higgledy piggledy mix of plants of different colours and shapes, all jostling for space, and I love it - which I think is the only thing that is important. I have tried to add a photo to show you, but not sure how to so have posted it in my photos.

Thanks Hiltonhen. You've made my mind up to give them a go!!

If you mean the big brilliant white waxy ones people call Easter lilies my neighbour has grown them for years in a very ordinary garden in full sun.