Blackberries under a high tunnel are on a swing-arm trellis. The trellis arms and canes are at an angle now. Fruiting laterals (branches) will grow up towards the light. Once the laterals are set growing in an upright position, the trellis arms will be moved to a near vertical position so that the fruit all hang on one side of the trellis where they are easier to see and pick.
K. Hanson: Tunnel Berries Outreach Coodinator