Bittersweet (Solanum dulcamara) belongs to the family Solanaceae (the Nightshade family). It is a perennial herb that is native to Europe and Asia, and now widely naturalized elsewhere. This herb grows in woodlands, scrubland, hedges and marshes. It is a semi-woody vine, which climbs up other plants and can reach about 4 m long. The leaves are roughly arrowhead-shaped, dark-green to purplish, and often lobed at the base. The purple, star-shaped flowers bloom in loose clusters from May to September. The fruits are ovate berry, bright red when ripe, and poisonous to humans and livestock.