<http://schema.org/description>
"Any plant with an underground storage organ is referred to as a bulb. There are many categories, with different names for different structures. There are true bulbs, corms, and tubers. Learn about perennial bulbs."^^<http://www.w3.org/2001/XMLSchema#string>
<http://home.howstuffworks.com/define-perennial-bulbs.htm>