How to Grow Highbush Blueberry 'Duke'

Young shrub establishing root system; minimal fruit production

Remove flower buds the first 2-3 years to encourage vegetative growth. Water deeply and consistently. Apply 3-4 inches of pine bark mulch. Avoid fertilizer the first year; use acid-forming fertilizer (ammonium sulfate) lightly starting year 2.

Shrub develops upright branching structure; increasing height and spread

Prune in late winter to encourage branching and air circulation. Remove weak, crossing, or low-hanging canes. Maintain mulch layer. Apply balanced acid-forming fertilizer in early spring and early summer.

Small, bell-shaped white or pale pink flowers appear in clusters along branches

Flowers appear in late April-early May in most regions. Ensure cross-pollination by planting a compatible pollinator variety (Northland, Patriot, or Bluecrop work well). Avoid late spring frosts that damage flower buds.

Berries develop from flowers, progressing from green to pink to dark blue with powdery bloom

Thin berries if overcrowded for larger fruit size. Provide consistent water, especially during dry periods. Monitor for pest pressure. Maintain even mulch coverage. Light fertilization can support fruiting.

Ripe berries ready for harvest; plant begins senescence and prepares for winter dormancy

Harvest ripe berries by gently rolling them into palm; they should drop easily. Continue watering until fall. Prune only after harvest if needed. Apply dormant oil in late winter to prevent overwintering pests.