Most likely agapanthus aka Nile lily. Even without knowing thee size, I am certain it is not the above suggestions http://en.wikipedia.org/wiki/Agapanthus http://www.google.com/search?q=nile+lily&hl=en&client=firefox-a&hs=2OD&rls=org.mozilla:en-US:official&prmd=ivns&tbm=isch&tbo=u&source=univ&sa=X&ei=NWg1TtaNHevUiALR0-W6CA&ved=0CDYQsAQ&biw=800&bih=446
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