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Greenhouse Grow How - Brigitte Zettl

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Learn tips about using a greenhouse for organic gardening.
Presentation by Brigitte Zettl. Website: http://crownvalleyorganics.com
These slides were part of a class by Brigitte Zettl. We are certainly pleased to share the slides, but we want to emphasize that the slides were only visual reminders for the in-depth verbal information given in the class.

Published in: Self Improvement
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Greenhouse Grow How - Brigitte Zettl

  1. 1. Greenhouse Grow How Created by: Brigitte Zettl
  2. 2. Introductions • Why are you here? • What are you growing? • When are you growing it?
  3. 3. Why Start Plants in a Greenhouse? • An earlier season • Efficient use of time • More control
  4. 4. Let’s Start With Basics… How Do We Enhance This Effect? • Choice of flooring • Choice of covering • Positioning of the structure
  5. 5. Light
  6. 6. What Kind of Structure is Right for You? www.hobby-greenhouse.com
  7. 7. Something a Bit Larger Perhaps?
  8. 8. Our Gutter-Connected Raised Quonsets
  9. 9. State of the Art Greenhouse Technology
  10. 10. Light Intensity • Different plants require various intensities • Too much light causes sunscald • Too little light will stunt growth and prevent blooming • Light levels are expressed in footcandles (fc) >5000 = Very high 4000 – 5000 = Full Sun 1800 – 4000 = Dappled Sunlight 1000 – 1800 = Shade <1000 = Deep Shade
  11. 11. Photoperiodism Some species are very affected by day length • Long Day - 14-18 hours (lettuce, beets) • Short Day – 12 hours or > (cucumbers, some tomatoes) • Day Neutral – any hours (kale, cabbage)
  12. 12. Airflow Natural Ventilation Forced Air Ventilation
  13. 13. Ventilation Positives Negatives • Releases moisture in the air • Increases pest exposure • Replenishes CO2 • Increases time/money spent • Reduces disease • Can expose plants to cold temperatures by accident
  14. 14. Temperature Goals • 55-80 degrees F. during the growing season • Coldest temperature during the couple hours around sunrise • In winter 38 F. is enough for cool season crops and perennials
  15. 15. Temperature Cooling • Ventilation • Fogging • Shade or Shade Cloth
  16. 16. Temperature Heating • Insulation • Heat Sinks • Decomposing Materials • Radiant Heat • Natural Gas
  17. 17. What You’re Growing In… Soiless Mix Containers Considerations: • Right Size Right Plant! • Aggregate Size • Reuse = Sterilize! • Microbial Content • Nutrient Content • pH Appropriate • Proper Mixing Procedure – Vinegar – 10% Bleach – Hydrogen Peroxide – Ethanol
  18. 18. Plant Nutrition Macro Nutrients Recommended Fertilizers: • Nitrogen Garden Tone / Plant Tone • Phosphorus Fish Fertilizer • Potassium Seaweed/Kelp • Calcium Worm Castings • Magnesium • Sulfur
  19. 19. Irrigation • Automated • Hand Watering • Watch the edges! • Seeds need special attention!
  20. 20. Propagation
  21. 21. Keeping Records
  22. 22. Sexual Propagation Choosing your seed… What Your Seed Likes… • Heirloom vs. Hybrid (F1) • Cool, dry conditions when the embryo is sleeping • Organic vs. Conventional • Moist, warm, humid conditions once the embryo has been awakened DO NOT LET YOUR SEED DRY OUT EVER ONCE YOU HAVE GOTTEN IT WET!!!
  23. 23. Our Germination Chamber
  24. 24. Asexual Propagation Types Tool’s You May Need • Budding • Sterilizing Solution • Cutting • A Very Sharp Knife • Division • Rooting Solution • Grafting • Layering • Tissue Culture
  25. 25. Taking Cuttings Woody Plants Herbaceous Plants • Softwood (Spring) • Whole leaf (succulents) • Semi-Ripe (Summer & Fall) • Part Leaf (begonia) • Hardwood (Winter) • Leaf-Bud • Root/Tuber
  26. 26. Benches
  27. 27. Integrated Pest Management • Set Thresholds • Monitor & Identify Pests • Prevention • Control • Evaluation - Assess • Implementation – be Proactive!
  28. 28. Integrated Pest Management
  29. 29. Monitoring for Greenhouse Pests Tools You Will Need: • Lighted Magnifier • Sticky Traps • A Good ID Book • A Notebook & Pen • The Internet • Your Local Extension Agents Phone Number
  30. 30. Common Offenders Aphids Cabbage Loopers
  31. 31. Common Offenders Fungus Gnats Crickets
  32. 32. Common Offenders Whiteflies Thrips
  33. 33. Common Offenders Rhizoctinia Downy Mildew
  34. 34. Common Offenders Root/Crown Rot Phytopthora Bacterial Leaf Spot (Septoria)
  35. 35. Recommended Reading I.P.M. • What’s Wrong With My Plant? (And How Do I Fix It?); D. Deardorff & Kathryn Wadsworth • Integrated Pest Management for Floriculture and Nurseries; UC Davis Publication 3402 Propagation • The American Horticultural Society, Plant Propagation; A. Toogood (Editor) • Seed to Seed; Suzanne Ashworth

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