I purchased some "Prime-Ark® Freedom Primocane Blackberry". Around 4-5 of them I planted in a corner area near my yard (against a fence). They are meant to be an upright cane and while they aren't scrambling everywhere on the ground...I wouldn't really call them "Upright" (Then again they are still pretty young as I JUST planted them maybe 3-4 months ago).
Whats the best way to "Contain" these. Since they are all in sort of a corner area, I don't really have a "Straight line" of bushes where I could just trellis them in a line. I was thinking some sort of string containment fence? (Imagine about 4-5 plants in the corner right angle of a fence, as thats what they are planted like right now)