A farmer prepares to harvest watermelons hanging in the air at a green house in Tajimi, Gifu Prefecture on July 11, 2019. Watermelons grow in the air, receiving an even sunlight and color and watermelon produce farmers are ready to ship for summer popular delicacy. ( The Yomiuri Shimbun via AP Images )

A farmer prepares to harvest watermelons hanging in the air at a green house in Tajimi, Gifu Prefecture on July 11, 2019. Watermelons grow in the air, receiving an even sunlight and color and watermelon produce farmers are ready to ship for summer popular delicacy. ( The Yomiuri Shimbun via AP Images )

Farmers prepare to harvest watermelons hanging in the air at a green house in Tajimi, Gifu Prefecture on July 11, 2019. Watermelons grow in the air, receiving an even sunlight and color and watermelon produce farmers are ready to ship for summer popular delicacy. ( The Yomiuri Shimbun via AP Images )

Watermelons are hung in the air at a green house in Tajimi, Gifu Prefecture on July 11, 2019. Watermelons grow in the air, receiving an even sunlight and color and watermelon produce farmers are ready to ship for summer popular delicacy. ( The Yomiuri Shimbun via AP Images )

A farmer prepares to harvest watermelons hanging in the air at a green house in Tajimi, Gifu Prefecture on July 11, 2019. Watermelons grow in the air, receiving an even sunlight and color and watermelon produce farmers are ready to ship for summer popular delicacy. ( The Yomiuri Shimbun via AP Images )

A farmer prepares to harvest watermelons hanging in the air at a green house in Tajimi, Gifu Prefecture on July 11, 2019. Watermelons grow in the air, receiving an even sunlight and color and watermelon produce farmers are ready to ship for summer popular delicacy. ( The Yomiuri Shimbun via AP Images )