Mystery plant in Normandy France

Observation - Mystery plant in Normandy France - Global. Description: i took seeds of this plant, because it was so lovely, all germinated well, plants have grown to 18-2ft. sticky leaves and stems, cut the plants down in August, now flourishing again and masses of flowers, does anyone know it's name please ?

i took seeds of this plant, because it was so lovely, all germinated well, plants have grown to 18"-2ft. sticky leaves and stems, cut the plants down in August, now flourishing again and masses of flowers, does anyone know it's name please ?