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Tayberries are named after the River Tay in Scotland.
Tayberries grow in Scotland and are sweeter than loganberries.
The Declaration • February 7, 2019 • https://thedeclarationatcoloniahigh.com/37368/fun-factofthe-day/a-tayberry-is-a-cross-between-a-raspberry-and-a-black-berry/
A tayberry is a cross between a raspberry and a black berry.