What is the name of this plant growing beside the building?

People say it brings good luck but they themselves don't know its name.Please help me identify its name. I have provided the link to view it's image (collage)
http://tinyurl.com/nu46mhc
Also, see it's flower. Sorry, I don't know it's original color when fresh.
http://tinyurl.com/lfun4h4
Onion
Asked Jun 07, 2014
Edited Jun 08, 2014

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