Each year from around mid-June to the first week of July, Yamagata's Nagai Ayame Park is filled with the color of around a million irises in bloom. From those million flowers, there are around 500 different varieties of them! The park holds an annual iris festival to celebrate their beauty, and it typically includes extra events like stage performances, sales of local produce, and even horseback riding.
Admission to the park is normally free, but during the iris blooming season there is an admission charge of 500 yen for adults and 200 yen for children.