"I have never seen anything like this," said tree surgeon Hiroyuki Wada. Two typhoons that recently struck the country are a likely cause of the sudden flowering.
The memorial is meant to commemorate women who were sexually enslaved by Japan's Imperial Army during WWII. Osaka's mayor has long threatened to sever relations with the California city because of it.
Less than a month after a powerful storm killed 11 people in northern Japan, another typhoon slammed the country, resulting in two deaths and widespread destruction.
The two leaders met for dinner at Trump Tower, where they discussed trade and military ties. The meeting comes as the U.S. considers imposing hefty import tariffs on foreign-made automobiles.
A Japanese news outlet is reporting at least 53 people were injured and another 20 have been reported missing. Officials fear people are trapped inside homes wiped out by a landslide.
Thousands were stranded in Kansai International Airport, on an island in Osaka Bay, after the bridge linking the airport to the main island was damaged.
In the 1980s, America's automakers were suffering as new competition came in from Japan. The U.S. response could serve as an example for the Trump administration in its ongoing trade battles.
Tokyo Medical University says it is investigating the reports. The points deduction was apparently aimed at keeping the number of female students at about 30 percent of the class.