Belgian horticulturist Johan Aelterman picks begonias from his field to be used in the giant flower carpet on Brussels' Grand Place celebrating the Belgo-Japanese friendship in Ghent, August 4, 2016. Picture taken August 4, 2016. REUTERS/Francois Lenoir - RTSMVGV

Belgian horticulturist Johan Aelterman picks begonias from his field to be used in the giant flower carpet on Brussels' Grand Place celebrating the Belgo-Japanese friendship in Ghent, August 4, 2016. Picture taken August 4, 2016. REUTERS/Francois Lenoir - RTSMVF3

Volunteers arrange begonias and dahlias to form a giant flower carpet on Brussels' Grand Place celebrating the Belgo-Japanese friendship in Brussels, August 12, 2016. REUTERS/Francois Lenoir - RTSMW2W

A giant flower carpet made of begonias and dahlias is illuminated at the Grand Place, celebrating the Belgo-Japanese friendship, in Brussels, Belgium, August 12, 2016. REUTERS/Francois Lenoir - RTSN1IS

Belgian horticulturist Johan Aelterman arranges begonias to form a giant flower carpet on Brussels' Grand Place celebrating the Belgo-Japanese friendship in Brussels, August 12, 2016. REUTERS/Francois Lenoir - RTSMVTJ. Image used for illustrative purpose

A giant flower carpet made of begonias and dahlias is illuminated at the Grand Place, celebrating the Belgo-Japanese friendship, in Brussels, Belgium, August 12, 2016. REUTERS/Francois Lenoir - RTSN1IT

A giant flower carpet made of begonias and dahlias is illuminated at the Grand Place, celebrating the Belgo-Japanese friendship, in Brussels, Belgium, August 12, 2016. REUTERS/Francois Lenoir - RTSN1IH

A giant flower carpet made of begonias and dahlias is pictured on Brussels' Grand Place celebrating the Belgo-Japanese friendship in Brussels, August 12, 2016.REUTERS/Francois Lenoir - RTSMVTI

Belgian horticulturist Johan Aelterman displays begonias from his field to be used in the giant flower carpet on Brussels' Grand Place celebrating the Belgo-Japanese friendship in Ghent, August 4, 2016. Picture taken August 4, 2016. REUTERS/Francois Lenoir - RTSMVH3

Volunteers arrange begonias and dahlias to form a giant flower carpet on Brussels' Grand Place celebrating the Belgo-Japanese friendship in Brussels, August 12, 2016. REUTERS/Francois Lenoir - RTSMVTV

Belgian horticulturist Johan Aelterman displays a begonia from his field to be used in the giant flower carpet on Brussels' Grand Place celebrating the Belgo-Japanese friendship in Ghent, August 4, 2016. Picture taken August 4, 2016. REUTERS/Francois Lenoir - RTSMVF1

Belgian horticulturist Johan Aelterman arranges begonias to form a giant flower carpet on Brussels' Grand Place celebrating the Belgo-Japanese friendship in Brussels, August 12, 2016. REUTERS/Francois Lenoir - RTSMVTW

Belgian horticulturist Johan Aelterman picks begonias from his field to be used in the giant flower carpet on Brussels' Grand Place celebrating the Belgo-Japanese friendship in Ghent, August 4, 2016. Picture taken August 4, 2016. REUTERS/Francois Lenoir - RTSMVF2

A giant flower carpet made of begonias and dahlias is pictured on Brussels' Grand Place celebrating the Belgo-Japanese friendship in Brussels, August 12, 2016. REUTERS/Francois Lenoir - RTSMVU2