Logan gathered and planted the seed. The 50 seedlings produced plants similar to the blackberry parent Aughinbaugh, but were larger and more vigorous. One was the Loganberry; the remaining 49 included the Mammoth Blackberry (the longest fruit of any variety ever grown). Since Logan's time, crosses between the cultivars of raspberry and blackberry have confirmed the Loganberry's parentage. Logan's original was introduced to Europe in 1897, while the 'American Thornless', a prickle-free mutation, was developed in 1933.
It has been used as a parent in more recent crosses between Rubus species, such as Tayberry (loganberry x raspberry), Boysenberry (loganberry x dewberry), Youngberry (Phenomenal berry x Austin Mayes dewberry), Santiam blackberry (loganberry x trailing blackberry) and Olallieberry (Black Logan x Youngberry).
The plants, being near each other, had intermixed or grown together. The judge, having noticed that they bloomed and ripened their fruit together, conceived the idea of planting the seeds, from which planting resulted the production of the Loganberry.
While the Loganberry is primarily harvested in the Western United States, growers there were unaware that a niche market existed for a Loganberry-derived drink to the east. According to local lore, the loganberry drink was developed by entrepreneurs in the late 1800s at Crystal Beach, a local summertime resort, and one time amusement park, in Southern Ontario. The drink continued to be served at the amusement park and is still produced there.
Source: Wikipedia > Loganberry
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