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Also know, do you need a trellis for blackberries?
Site Selection for Blackberry Bushes Soil: Prefer acidic to slightly basic (6.0-7.0), well-drained, organic soil. Plant blackberries 300 feet away from raspberries. Trellis Support Not Needed: 'Arapaho' blackberries do not need a trellis for support. However, they can be trained to a trellis no higher than 6'-8'.
Similarly, how do you Trellis trailing blackberries?
Trellis Trailing Blackberries Explore a two-wire system, running a top wire at five to six feet with a second line 18 inches below the top wire. After the first year, there will be fruiting floricanes along the wires. Train the new primocanes into a narrow row below the fruiting canes.
Dig down and around the root ball of the bush. Digging up the root ball won't eradicate the plant since blackberries can propagate via rhizomes, but it will make tilling the soil easier. Till the soil frequently to destroy any new blackberry growth. Till the soil once a week or whenever you see new plantlets.