I grew up in Oregon, the Willamette Valley, to be precise. Blackberries I learned in later years are considered by botanists to be an exotic infestation, since blackberries are not native to the area. They have no natural competitors, and grow wild over any disturbed or neglected patch of ground, along road sides, even city parks. I remember walking home from school in early September and picking many on my way home. Nice thing about the Pacific North West is there are no chiggers to contend with.
I'd go home, get a big Tupperware bowl, or anything else, go back to the berry patch, fill the container, go back home, put some on ice cream, maybe next morning (if there were any left) have 'em on my cereal.
They're cultivated here in Kansas. And they rather taste like it, too; not as sweet or pungent as the blackberries in Oregon. Oh yeah, and if I brought in a very large harvest, I could usually talk Mom into making blackberry pie. Man, I'm getting homesick again.