Blackberry plant has a biennial erect or partially erect stem with sharp spikes and dark green leaves with clusters of pinkish-white blossoms. It yields purple black aggregate fruit which comprises of multiple smaller fleshy segments or drupelets. Blackberries have a fragile and smooth skin with somewhat greenish core which lengthens nearly to the base of the berry. Immature blackberries are generally red or green and hard to touch which later turns into black, soft, juicy and glossy fruit on ripening.