Each year in the rainy season, Fukuoka's Miyajidake Shrine comes alive with around 100,000 iris flowers in 100 different species decorating the grounds. An annual festival celebrates the beauty of these flowers, and it typically runs from around the last week of May through to around the 10th of June. For those who can't make it to the shrine grounds during the day, the flowers are illuminated after sunset until 9 pm.
As is the case with all flower festivals, the official dates can be subject to fluctuation from year to year, depending on blooming conditions. It is advisable to check the official shrine website closer to May to get a definite confirmation of when the festival will go ahead.
Admission to the event is free of charge.