The Tayside and Angus area is a centre of production of soft fruits such as strawberries, raspberries and loganberries, owing to the mild climate.
Since Logan's time, crosses between the cultivars of raspberry and blackberry have confirmed the Loganberry's parentage, with an earlier theory that the Loganberry originated as a red-fruiting form of the common Californian blackberry Rubus ursinus now disproved.
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The loganberry was derived from a cross between Rubus ursinus (R. vitifolius) 'Aughinbaugh' as the female parent and Rubus idaeus 'Red Antwerp' as the male parent (pollen source).
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The loganberry (Rubus × loganobaccus) is an hexaploid hybrid produced from pollination of a plant of the octaploid blackberry cultivar 'Aughinbaugh' (Rubus ursinus) by a diploid red raspberry (Rubus idaeus).
The exact origins of the boysenberry are unclear but the most definite records trace the plant as it's known today back to grower Rudolph Boysen, who may have gotten the dewberry/loganberry parent from the farm of a man by the name of John Lubben (who called it a "lubbenberry"), who in turn may have gotten it from Luther Burbank.