The ruins of Fujiwara Palace in Nara are home to a range of great flower events throughout the year. In spring there are colorful yellow canola flowers, in late-July through mid-August there are lovely lotus flowers, and throughout October pink cosmos fill the grounds as far as the eye can see. The cosmos in particular are truly a sight to behold, turning the grounds into something resembling a fairytale scene.
The best place to check for up to date information on the cosmos flowering situation is the official Kashihara Tourism Facebook page.
Admission the the palace ruins is free of charge.