'Sunflower' Pawpaw Tree - The Sunflower Pawpaw has won First Prize at the 2010 Ohio Pawpaw Festival. 'Sunflower' Pawpaws have  greenish yellow skin, with a buttery flesh and only a few seeds. 'Sunflower' Pawpaws ripen in late September to early October.  . (USDA Zones 5-8)