Lowbush blueberry, Vaccinium angustifolium.

The lowbush blueberry (Vaccinium angustifolium) can grow as tall as 60 cm, but usually reaches less than 35 cm. It has both erect and spreading branches. Each mature shrub's height is determined primarily by the amount of sunlight it receives: as the length of daylight hours decreases, vegetative (i.e. green) growth stops. The floral buds that will produce next year's berries begin to form at this point. The low height is advantageous because the highest buds are the last to be formed, and they are the least resistant to the deepest cold of winter.