You may want to post this over on the bulb forum as altrtomeria are not true lilies. Good luck.

Thanks hostaholic, I'll do just that. I didn't know they weren't lilies. I just thought they were a little different version of them. Thanks for your help. Judy

They're not bulbs, either :-) They are just fleshy rooted perennials native to South America. Those things that look like bulbs are water storage organs - enlarged roots. 'Princess lily' is just a common name, like Peruvian lily. Most of the ones with a wide variety of colors - like you see in the grocery stores or florists as cut flowers - are rather tender and picky hybrids that are not fully hardy in most climates. They are best left to greenhouse growing :-) There are other selections, notably the ligtu hybrids, that are hardier and will do well in many gardens but in mild climates (zones 8 and above), they can be an incredible pest, reseeding with abandon and spreading everywhere.

Unfortunately, I know this from personal experience. And those dang white rootlets grow down deep and every one left in the soil - even small, broken chunks - will develop into another plant.

Thanks gardengal, I answered you over on the bulb forum. Thanks, Judy

Hey gardengal, thanks for the info.Don't think I'd ever happy to worry about them becoming a pest in my garden.