Aerial photo taken on Aug. 17, 2019 shows blooming vervains at an ecological garden on border of the Maowusu Desert in northwest China's Ningxia Hui Autonomous Region. The ecological garden reclaimed sanded lands to cultivate ornamental plants to promote local tourism. (Photo: Xinhua)

Photo taken on Aug. 17, 2019 shows blooming vervains at an ecological garden on border of the Maowusu Desert in northwest China's Ningxia Hui Autonomous Region. The ecological garden reclaimed sanded lands to cultivate ornamental plants to promote local tourism. (Photo: Xinhua)

Aerial photo taken on Aug. 17, 2019 shows blooming vervains at an ecological garden on border of the Maowusu Desert in northwest China's Ningxia Hui Autonomous Region. The ecological garden reclaimed sanded lands to cultivate ornamental plants to promote local tourism. (Photo: Xinhua)

Photo taken on Aug. 17, 2019 shows blooming vervains at an ecological garden on border of the Maowusu Desert in northwest China's Ningxia Hui Autonomous Region. The ecological garden reclaimed sanded lands to cultivate ornamental plants to promote local tourism. (Photo: Xinhua)

Photo taken on Aug. 17, 2019 shows blooming vervains at an ecological garden on border of the Maowusu Desert in northwest China's Ningxia Hui Autonomous Region. The ecological garden reclaimed sanded lands to cultivate ornamental plants to promote local tourism.(Photo: Xinhua)

Photo taken on Aug. 17, 2019 shows blooming vervains at an ecological garden on border of the Maowusu Desert in northwest China's Ningxia Hui Autonomous Region. The ecological garden reclaimed sanded lands to cultivate ornamental plants to promote local tourism. (Photo: Xinhua)

Photo taken on Aug. 17, 2019 shows blooming vervains at an ecological garden on border of the Maowusu Desert in northwest China's Ningxia Hui Autonomous Region. The ecological garden reclaimed sanded lands to cultivate ornamental plants to promote local tourism. (Photo: Xinhua)

Aerial photo taken on Aug. 17, 2019 shows a field of blooming vervains at an ecological garden on border of the Maowusu Desert in northwest China's Ningxia Hui Autonomous Region. The ecological garden reclaimed sanded lands to cultivate ornamental plants to promote local tourism.(Photo: Xinhua)

Aerial photo taken on Aug. 17, 2019 shows blooming vervains at an ecological garden on border of the Maowusu Desert in northwest China's Ningxia Hui Autonomous Region. The ecological garden reclaimed sanded lands to cultivate ornamental plants to promote local tourism. (Photo: Xinhua)

Aerial photo taken on Aug. 17, 2019 shows blooming vervains at an ecological garden on border of the Maowusu Desert in northwest China's Ningxia Hui Autonomous Region. The ecological garden reclaimed sanded lands to cultivate ornamental plants to promote local tourism. (Photo: Xinhua)

Photo taken on Aug. 17, 2019 shows blooming vervains at an ecological garden on border of the Maowusu Desert in northwest China's Ningxia Hui Autonomous Region. The ecological garden reclaimed sanded lands to cultivate ornamental plants to promote local tourism. (Photo: Xinhua)

A tourist takes selfie amid blooming vervains at an ecological garden on border of the Maowusu Desert in northwest China's Ningxia Hui Autonomous Region, Aug. 17, 2019. The ecological garden reclaimed sanded lands to cultivate ornamental plants to promote local tourism. (Photo: Xinhua)

Photo taken on Aug. 17, 2019 shows blooming vervains at an ecological garden on border of the Maowusu Desert in northwest China's Ningxia Hui Autonomous Region. The ecological garden reclaimed sanded lands to cultivate ornamental plants to promote local tourism. (Photo: Xinhua)

Photo taken on Aug. 17, 2019 shows blooming vervains at an ecological garden on border of the Maowusu Desert in northwest China's Ningxia Hui Autonomous Region. The ecological garden reclaimed sanded lands to cultivate ornamental plants to promote local tourism. (Photo: Xinhua)

Aerial photo taken on Aug. 17, 2019 shows blooming vervains at an ecological garden on border of the Maowusu Desert in northwest China's Ningxia Hui Autonomous Region. The ecological garden reclaimed sanded lands to cultivate ornamental plants to promote local tourism.(Photo: Xinhua)