Planted Tank Enthusiast
Join Date: Sep 2009
Location: Kingman, Arizona
They're not 'tiger lilies', but water lilies. Tiger lilies are a lily that does not live in the water, but in a flower bed, it's orange with black spots on the petals. =)
I tried one once in a planted tank and it just never took off. I don't know why, it was years ago. You'll need a ton of space for it though, they can get huge, and I think they have to be a really big size before they will flower--more than just three or four lily pads.
To find information on caring for them, you might try pond/water gardening websites. Or just do a search for water lily.