The Koiwa Iris Garden is a large patch along the Edogawa River. With about 50,000 iris plants, the garden comes alive with purple, white, and pink irises in late May and June.

With irises mainly donated by residents, the garden opened in June 1982. A 5-min. walk from Edogawa Station on the Keisei Line or 25 min. walk from Koiwa Station on the JR Sobu Line. Free admission. I walked from Koiwa Station and saw this sign for the Koiwa Iris Garden (Koiwa Shobu-en).