How to Prune Vaccinium 'Berkeley'?
More mature plants benefit from regular pruning. See blueberry pruning

Vaccinium 'Berkeley' · Vaccinium 'Berkeley'
Plant in a sheltered site in well-drained, moisture-retentive, acidic soil, (pH 4.5-5.5) in sun or part shade. Alternatively grow in containers or raised beds filled with ericaceous compost such as John Innes Ericaceous. Pot grown plants benefit from winter protection. For optimal pollination and yield plant three different cultivars. For further details see blueberry cultivation
More mature plants benefit from regular pruning. See blueberry pruning