Answer: The flower you describe might be Lisianthus (Eustoma grandiflorum), also called Prarie Gentian. It's a biennial or short-lived perennial, performing best where summers are hot. Place your plant in a sunny spot, in moist, well-draining soil. Pinch out young stems to increase flower production, and try to keep water off the foliage and blossoms.
Just to make sure we're talking about the same plant, there's a picture of a new pink strain on the following website: http://www.xenios.com/
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