The 9th West Lake Chinese Rose Exhibition kicks off in Hangzhou, East China's Zhejiang province on April 28, with over 300 varieties of Chinese roses on display. (Photo: hangzhou.com.cn)

The 9th West Lake Chinese Rose Exhibition kicks off in Hangzhou, East China's Zhejiang province on April 28, with over 300 varieties of Chinese roses on display. (Photo: hangzhou.com.cn)

The 9th West Lake Chinese Rose Exhibition kicks off in Hangzhou, East China's Zhejiang province on April 28, with over 300 varieties of Chinese roses on display. (Photo: hangzhou.com.cn)

The 9th West Lake Chinese Rose Exhibition kicks off in Hangzhou, East China's Zhejiang province on April 28, with over 300 varieties of Chinese roses on display. (Photo: hangzhou.com.cn)

The 9th West Lake Chinese Rose Exhibition kicks off in Hangzhou, East China's Zhejiang province on April 28, with over 300 varieties of Chinese roses on display. (Photo: hangzhou.com.cn)

The 9th West Lake Chinese Rose Exhibition kicks off in Hangzhou, East China's Zhejiang province on April 28, with over 300 varieties of Chinese roses on display. (Photo: hangzhou.com.cn)

The 9th West Lake Chinese Rose Exhibition kicks off in Hangzhou, East China's Zhejiang province on April 28, with over 300 varieties of Chinese roses on display. (Photo: hangzhou.com.cn)

The 9th West Lake Chinese Rose Exhibition kicks off in Hangzhou, East China's Zhejiang province on April 28, with over 300 varieties of Chinese roses on display. (Photo: hangzhou.com.cn)