The olallieberry (pronounced oh-la-leh, sometimes spelled ollalieberry, olallaberry, olalliberry, ollalaberry or ollaliberry) is the marketing name for the 'Olallie' blackberry released by the USDA-ARS (in collaboration with Oregon State University) that was a selection from a cross between the 'Black Logan' (syn. 'Mammoth'), developed by Judge James Logan in California, and the youngberry, which was developed by Byrnes M. Young in Louisiana. According to Judge Logan, 'Black Logan' was from a cross between the eastern blackberry 'Crandall' and the western dewberry 'Aughinbaugh'. 'Youngberry' was from a cross of 'Phenomenal' x 'Austin Mayes'. 'Phenomenal' in turn is a cross of the 'Aughinbaugh' western dewberry and 'Cuthbert' red raspberry and so has a very similar background to Logan's 'Loganberry' and shares a parent with his 'Black Logan'.
The original cross was made in 1935 by George Waldo with the United States Department of Agriculture Agricultural Research Service (USDA-ARS), who ran the cooperative blackberry breeding program between the USDA-ARS and Oregon State University from 1932 until the 1960s. Selected in 1937 and tested in Oregon, Washington and California as "Oregon 609" (OSC 609), it was named "Olallie" and released in 1950.
- While developed in Oregon, it has never been very productive there and is therefore primarily grown in California.
- Formally named "Olallie", it has usually been marketed as olallieberry, just as "Marion" is sold as marionberry.
- "Olallie" means berry in the Chinook Jargon.
- Olallie Lake in Oregon's Cascade Range is named after the Chinook term due to the abundance of berries in that area.