How should I prune Prime Ark Freedom blackberry plants for optimal growth and fruit production?

To prune Prime Ark Freedom blackberry plants for optimal growth and fruit production, you should prune them in late winter or early spring before new growth begins. Remove dead or damaged canes, as well as any canes that are thinner than a pencil. Trim lateral branches to about 12-18 inches long to encourage new growth and fruit production. Additionally, thin out crowded areas to improve air circulation and sunlight exposure. Regular pruning will help maintain the health and productivity of your blackberry plants.