If anyone is still chasing and is in the NY area, this weekend is the Sakura Matsuri at the Brooklyn Botanical Garden, and the cherry trees are gorgeous. Lilacs are also blooming, and some of the wisteria have started.
On the down side, the lines to get in are ridiculous (fortunately I was able to use the extremely short members' line) and it's quite crowded. But in addition to the flowers, you get to see NY kids dressed up in the gothic Lolita look!