across japan the cherry blossom is blooming, and the whole country someone gripped by hanai. quite literally looking at flowers. the verdict for this hanami season is it's as good as it gets. >> it looks like its snowing. >> i'm glad i was born japanese. >> it makes you happy and you forget all your troubles. >> pulling in the crowds is the knowledge that one bad storm could blow it all away. it is all the more beautiful for being so fleeting. >> and this could be the source of much of that beauty. it's one of a number of hybrids here in this park in northern tokyo that is more than 100 years old, and has been the subject of a recent university study. they believe that grass taken from this one tree could be the origin of the marachino, the most common variety in full bloom right now. sharing a common genetic background would help explain why th it comes with so much certain point and invaluable for the tourism industry. tokyo district plans a festival around it. promoting it's own cherry trees and merchant dieing everything to do with the blossom. >> at nighttime promises ar