The Toka plum, also called Bubblegum plum, is a super sweet plum that was developed about 100 years ago in South Dakota. It's cold hardy to negative 50 degrees! Toka is a clingstone plum with yellow flesh and red skin. Heavy bearer and plums are medium to large in size. Toka is one of the best pollinators of other plum trees. USDA Zones 4-8. 600-700 chill hours. Fruit ripens in August or September. Toka is a cross between an apricot and a plum.