People take photos before a flower tower at Groot-Bijgaarden castle in the suburb of Brussels, Belgium, April 6, 2019. The 16th Floralia Brussels, a spring flower show, kicked off Saturday at Groot-Bijgaarden castle and will last until May 5. Over one million flowers of almost 500 varieties are presented during the flower show. (Photos: Xinhua)

A tourist takes pictures of a flower-made "peacock" at Groot-Bijgaarden castle in the suburb of Brussels, Belgium, April 6, 2019. The 16th Floralia Brussels, a spring flower show, kicked off Saturday at Groot-Bijgaarden castle and will last until May 5. Over one million flowers of almost 500 varieties are presented during the flower show.

People enjoy a moment at Groot-Bijgaarden castle in the suburb of Brussels, Belgium, April 6, 2019. The 16th Floralia Brussels, a spring flower show, kicked off Saturday at Groot-Bijgaarden castle and will last until May 5. Over one million flowers of almost 500 varieties are presented during the flower show.

Photo taken on April 6, 2019 shows the Groot-Bijgaarden castle in the suburb of Brussels, Belgium. The 16th Floralia Brussels, a spring flower show, kicked off Saturday at Groot-Bijgaarden castle and will last until May 5. Over one million flowers of almost 500 varieties are presented during the flower show.

People walk in Groot-Bijgaarden castle in the suburb of Brussels, Belgium, April 6, 2019. The 16th Floralia Brussels, a spring flower show, kicked off Saturday at Groot-Bijgaarden castle and will last until May 5. Over one million flowers of almost 500 varieties are presented during the flower show.

Children pose for photos among flowers at Groot-Bijgaarden castle in the suburb of Brussels, Belgium, April 6, 2019. The 16th Floralia Brussels, a spring flower show, kicked off Saturday at Groot-Bijgaarden castle and will last until May 5. Over one million flowers of almost 500 varieties are presented during the flower show.

People walk among flowers at Groot-Bijgaarden castle in the suburb of Brussels, Belgium, April 6, 2019. The 16th Floralia Brussels, a spring flower show, kicked off Saturday at Groot-Bijgaarden castle and will last until May 5. Over one million flowers of almost 500 varieties are presented during the flower show.

Photo taken on April 6, 2019 shows tulips at Groot-Bijgaarden castle in the suburb of Brussels, Belgium. The 16th Floralia Brussels, a spring flower show, kicked off Saturday at Groot-Bijgaarden castle and will last until May 5. Over one million flowers of almost 500 varieties are presented during the flower show.

Photo taken on April 6, 2019 shows tulips at Groot-Bijgaarden castle in the suburb of Brussels, Belgium. The 16th Floralia Brussels, a spring flower show, kicked off Saturday at Groot-Bijgaarden castle and will last until May 5. Over one million flowers of almost 500 varieties are presented during the flower show.

People walk in Groot-Bijgaarden castle in the suburb of Brussels, Belgium, April 6, 2019. The 16th Floralia Brussels, a spring flower show, kicked off Saturday at Groot-Bijgaarden castle and will last until May 5. Over one million flowers of almost 500 varieties are presented during the flower show.

A tourist takes pictures of pear flowers at Groot-Bijgaarden castle in the suburb of Brussels, Belgium, April 6, 2019. The 16th Floralia Brussels, a spring flower show, kicked off Saturday at Groot-Bijgaarden castle and will last until May 5. Over one million flowers of almost 500 varieties are presented during the flower show.

People walk among flowers at Groot-Bijgaarden castle in the suburb of Brussels, Belgium, April 6, 2019. The 16th Floralia Brussels, a spring flower show, kicked off Saturday at Groot-Bijgaarden castle and will last until May 5. Over one million flowers of almost 500 varieties are presented during the flower show.

People walk among flowers at Groot-Bijgaarden castle in the suburb of Brussels, Belgium, April 6, 2019. The 16th Floralia Brussels, a spring flower show, kicked off Saturday at Groot-Bijgaarden castle and will last until May 5. Over one million flowers of almost 500 varieties are presented during the flower show.

A tourist takes pictures of flowers at Groot-Bijgaarden castle in the suburb of Brussels, Belgium, April 6, 2019. The 16th Floralia Brussels, a spring flower show, kicked off Saturday at Groot-Bijgaarden castle and will last until May 5. Over one million flowers of almost 500 varieties are presented during the flower show.

People walk in Groot-Bijgaarden castle in the suburb of Brussels, Belgium, April 6, 2019. The 16th Floralia Brussels, a spring flower show, kicked off Saturday at Groot-Bijgaarden castle and will last until May 5. Over one million flowers of almost 500 varieties are presented during the flower show.