In 1881 James Harvey Logan, a horticulturalist is Santa Cruz, California created the Loganberry. He unsatisfied with the existing varieties of blackberries and tried crossing two varieties of blackberries to produce a superior cultivar. He happened to plant them next to plants of an old variety of red raspberry, 'Red Antwerp', all of which flowered and fruited together. Logan then gathered and planted the seed from his cross-bred plants. His 50 seedlings produced plants similar to the blackberry parent 'Aughinbaugh', but larger and more vigorous. One was the Loganberry; the others included the 'Mammoth' blackberry.
Loganberries are so high in vitamin C that during the 20th century they were used by The Royal Navy to prevent scurvy onboard naval ships. You can get the same benefit by growing them in your garden. Typically loganberries are quite thorny, but we have “thornless” loganberries available! Buy them bare root now.