Answer: You can force lilies in a greenhouse but the process is rather complicated. They need temperatures of 68F degrees. If you're really interested in pursuing this, here's a website with some background information: http://www.greenhousegrower.com/magazine/?storyid=470
You can feed an actively growing tuberose with a time-release 8-8-8 fertilizer to provide the nutrients necessary for good growth and flowering.
Q&A Library Searching Tips