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Blueberry Maintenance Calendar

Once blueberry plants are established, major horticultural considerations are nutrition, water management, pruning, pollination, harvesting, marketing, and weed and other pest management.

Many cultural operations are timed to the annual growth cycle of the plants, which varies from year to year with climate and soil conditions.

Yearly calendar (1)

Dormant : November to mid-March

  • Apply fall herbicides, November to December
  • Prune
  • Apply pre-emergent herbicides before weed growth starts, late February to mid-March
  • Apply dormant spray for scale control
  • Apply copper for bacterial canker
  • Remove diseased and winter-injured tissue

Leaf and flower bud break : Late March to late April

  • Apply fungicide for primary mummy berry control (if needed)
  • Make first fertilizer application
  • Control weeds by cultivation and/or herbicides
  • Apply copper for bacterial canker

Bloom period : Late April to late May

  • Apply fungicides for secondary mummy berry (if needed) and Botrytis
  • Apply insecticides to control fruitworm and aphids, if needed
  • Introduce bees for pollination
  • Make second fertilizer application late May to early June

Fruit development : June and July

  • Cultivate for weed control in row middles
  • Make third fertilizer application, early to mid-July, if needed
  • Irrigate as needed
  • Install bird damage control devices
  • Collect plant tissue nutritional analyses late July

Harvest : July to September

  • Harvest and market fruit
  • Irrigate as needed

Postharvest growth : September to mid-October

  • Cultivate to control weeds
  • Irrigate as needed
  • Remove bird damage control devices

(1) Use this only as a general planning guide. Other pest control practices may be required depending on your area and circumstances. Consult the PNW pest control handbooks or area pest management guides for specific recommendations.

This fact sheet is adapted from Oregon State University Extension Publication PNW215, Highbush Blueberry Production. The authors of Highbush Blueberry Production are – Oregon State University: Bernadine Strik, Glenn Fisher, John Hart, Russ Ingham, Diane Kaufman, Ross Penhallegon, Jay Pscheidt and Ray William; Washington State University: Charles Brun, M. Ahmedullah, Art Antonelli, Leonard Askham, Peter Bristow, Dyvon Havens, Bill Scheer, and Carl Shanks; University of Idaho: Dan Barney. PNW215, Highbush Blueberry Production can be purchased from the Department of Extension & Experiment Station Communications, Oregon State University. How to Order