Mistletoe.
The answer is mistletoe!
mistletoe in French is gui.
Mistletoe is in the Viscacea and Loranthacea plant families.
England
Hang upside down
Hang the mistletoe and holly!
Mistletoe perhaps.
Actually back in when Celt were around mistletoe was found to be very usefull and was meant to heal you. The Romans thought that enemies who met under Mistletoe were friends so the tradition went on to England were it is good luck to hang it
when you hang it any two people that are under it have to kiss
Lights Wreath Ornaments Mistletoe Stockings
'le gui' is 'mistletoe' in English