by 
The Curious Bag
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Blackberries grow on bushes and make a wonderful summer treat for those who grow them or find them in the wild. Some people find them a nuisance, but consistent trimming can solve this problem.
Leaves
Blackberry leaves taper to a point and often have fringed edges. They grow alternately on the stem, rather than directly across from one another, and each leaf actually consists of three to five leaflets, according to Rosie Lerner of Purdue University.
Flowers
Before the berries appear, blackberry bushes grow small white or pinkish flowers. A spray of pistils reaches out from the center of the flower.
Berries
Blackberries are pinkish red before they ripen, and when fully ripe, they turn black, plump and shiny. They peak in June in the south and in July or August in the north, according to PickYourOwn.org.
Thorns
Sharp thorns grow on blackberry bushes. Thus, people often wear gloves and long sleeves when picking the berries.
Structure
A blackberry bush is made up of numerous canes, each of which bear leaves and berries. New canes grow each year and flower the following year.
Size
Blackberry bushes spread quickly. Often, they border a yard, sometimes extending into the forest in dense thickets.
Source:
Rosie Lerner, Purdue University: Blackberries
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