The cheery spectacle rolls up the Japanese archipelago from Okinawa in the tropical south to Hokkaido in the north like a floral Mexican wave. Yet its fleetingly ephemeral nature, as clouds of petals flutter like confetti in the wind, seasons it with sadness - and makes timing crucial. Which is why, insomnia-crazed and neon-blind, I went a bit Bill Murray when I realised I was too early.
A Tokyo-based friend just laughed, however. "It's OK, you'll be here for the ume."
Ume or plum, it turns out, is the new cherry. Bold, blowsy cherry blossom might have hogged the limelight for years, but it's plum, in fact, that heralds the arrival of spring in Japan. Plum trees flower in February and March - usually a month earlier than cherry. The first picnic of the year is traditionally held beneath the plum trees' blossom-laced branches - as long as the snow has melted. Before the cherry even has time to bud, plum gently breaks into bloom, preening its petals in the weak sun. The Japanese celebrate cherry's shy sibling, the Cinderella of trees, with plum festivals (ume matsuri) in parks and precincts of temples and shrines across the country.
To be honest, unless you're a fruit-tree nerd, one blossoming tree is as pretty as the next - although the plum is more fragrant than the cherry and its fruit more versatile. Plums are traditionally preserved in salt, but the sour, pickled umeboshi (sometimes served in bento boxes) is an acquired taste. They are also made into a sweet plum wine, umeshu, which is slightly more palatable.
The plum tree was brought to Japan from China in the eighth century and is believed to ward off danger, which is why you'll find it planted at the gates of religious temples and shrines. Apart from languishing in cherry's shadow, it's had other trials to contend with, most recently plum pox. A year ago in Ome City, outside Tokyo, all of Umeno Koen's (Plum Park) trees (around 3,000) were felled to stop an outbreak of the disease spreading. They will be replanted - but only after the area has been pox-free for three years.
Plum blossom can be seen in the parks that dot many of Japan's cities. In Tokyo, plum parties are held in Hanegi Park; in Kyoto the Kitano Tenmangu Shrine has 2,000 plum trees; while the Kairakuen Garden, an hour north of Tokyo by train, is a spectacular landscaped garden and blossom viewing site, with around 3,000 plum trees. The festival starts today and runs to the end of March.