Are there any bulbs that don't need a cold period when forcing them indoors?

FAQ
Question: 

Are there any bulbs that don't need a cold period when forcing them indoors?

Answer: 

Forcing flower bulbs indoors is an excellent way to brighten the cold, gray days of winter.  Tulips, daffodils, hyacinths, crocuses, and other spring-flowering bulbs can be forced indoors.  After planting, spring-flowering bulbs need to be exposed to temperatures of 40 to 45 degrees Fahrenheit for 12 to 16 weeks.  Spring-flowering bulbs will not bloom properly without the cold period.  Amaryllis and paperwhite narcissus can also be forced indoors.  Amaryllis bulbs require no cold period.  Paperwhite narcissus perform best when placed in a cool (45 to 50 degrees Fahrenheit), dark location for 2 to 3 weeks after potting.  A cool, dark location encourages the paperwhite narcissus bulbs to develop a good root system before the shoots begin to grow.  

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