The Ranzan Lavender festival started in 2018 at the Sennen No Sono Lavender Field. From its inception the field was the largest lavender field in the Kanto area. However, in 2019 they planted additional lavender flowers for a total of 50,000 lavender over eight hectares and it became the largest lavender field in the whole of Japan.
The festival is on from early June to early July. However, prime viewing is not until toward the end of the festival. Generally the very end of June. It costs 500 yen to enter the festival area. You receive a postcard that smells of lavender with your entry ticket. They have five different types of lavender including the rare white type. There are several food booths and a couple of food vans in the rest area just as you enter the festival grounds. The festival site is open from 9 am to 5 pm with last entry at 4.30 pm.