Ajisai 2AJI 2 Hydrangea Orange by Jason Yenter for In the Beginning. Japan's month long rainy season (tsuyu, ??) usually ends in mid-July, and that means there are precious few days left to savor its SPECIAL BEAUTY. Many Japanese consider Ajisai (???, or hydrangea) to be the quintessential flower of this season, as they look just right when wet, and enshrouded in mist. Gorgeous hydrangea's in shades of orange.