Aesculus hippocastanum
In warmer countries "Oxycarenus lavaterae" hibernates as adults. These bugs form large aggregates on trunks and branches of the trees to overwinter, typically on lime trees (Tilia)("Tilia americana", "Tillia cordata", "Tillia parviflora", "Tillia platyphyllos"), less frequently on other plants ("Populus", "Platanus", "Aesculus hippocastanum").