quality:corruption
Hybrids

'Marion' (marketed as " marionberry ") is an important cultivar that was selected from seedlings from a cross between 'Chehalem' and 'Olallie' (commonly called " Olallieberry ") berries. 'Olallie' in turn is a cross between loganberry and youngberry. 'Marion', 'Chehalem' and 'Olallie' are just three of many trailing blackberry cultivars developed by the United States Department of Agriculture Agricultural Research Service (USDA-ARS) blackberry breeding program at Oregon State University in Corvallis, Oregon.

The most recent cultivars released from this program are the thornless cultivars 'Black Diamond', 'Black Pearl', and 'Nightfall' as well as the early-ripening 'Obsidian' and 'Metolius'. 'Black Diamond' is now the leading cultivar being planted in the Pacific Northwest. Some of the other cultivars from this program are 'Newberry', 'Waldo', 'Siskiyou', 'Black Butte', ' Kotata ', 'Pacific', and 'Cascade'.

Varieties with good commercial characteristics developed in Arkansas are grown in nurseries in Oklahoma. Such blackberries are easy to grow, and may produce fruit for a decade or more. These varieties have diverse flavors varying from sweet to tart.