Blackberries tend to be much larger—they range from 1 to 2 inches in length, whereas black raspberries average between ½ to ¾ inch long. Another way to tell them apart is that blackberries are shiny and have a white plug at the top where they come off the stem. Black raspberries are fuzzy and hollow in the center. The flavors also differ, with black raspberries having a very sweet, jammy, sun-kissed sweetness. Blackberries have more of a floral flavor as well as sweetness.