“Forcing” bulbs – as we described in this post about hyacinths – is the means by which light and temperature can be manipulated in order to control the rate at which a plant grows. In most parts of the United States, lilies naturally would bloom in the summer – weeks after Easter.
Some other facts about Easter lilies:
Flowering and green houseplants (46 percent) account for the biggest chunk of Easter/Passover floral sales. Lilies (52 percent) account for most flowering houseplant sales. (aboutflowers.com)
Lilies are considered highly toxic to cats. The Society of American Florists recommends keeping lilies out of the reach of cats as ingesting even small amounts of the plant can cause kidney failure. Lilies do not pose a problem for other pets or humans. (aboutflowers.com)
In the home, Easter lilies prefer moderately cool temperatures (recommended 60 to 65 degrees during the day, slightly cooler at night). They thrive near a window in bright, indirect natural daylight. (Texas A&M Agrilife Extension)