The next common variety is the sour top blueberry, Vaccinium myrtilloides . This species tends to be more prevalent in mountains or hilly areas. Stems and leaves are covered with tiny hairs and are more branched than are those of the low sweet. Sour top stems grow six to 24 inches tall. Leaves are light green, hairy on the underside and tend to curl down on the edges, earning its other name, velvet leaf blueberry.
Berries are usually smaller and less sweet than the low sweet.
They are bright blue and covered with a waxy coating. Growth Habits of the Wild Blueberry Wild plants of the highbush blueberry, Vaccinium corymbosum , are also found along lakes or ponds adjacent to managed wild blueberry fields and occasionally will cross with the lowbush plants to produce a hybrid that has characteristics of each plant. The cultivated varieties of the highbush blueberry are grown in home gardens and in small plantings but are not part of the commercial wild blueberry industry in Maine. Wild blueberry plants occur naturally in the understory of the forest in Maine. Blueberry plants are initially established from seed.