Grape Growing: Intermediate Techniques for Better Harvests

Introduction

You've established grapevines and want to improve your harvests. This intermediate guide covers strategic variety selection, detailed training systems, canopy management, integrated pest and disease control, and techniques to maximize fruit quality.

Advanced Variety Selection

Matching Varieties to Climate

Cold climates (Zones 3-5):

Moderate climates (Zones 6-7):

Warm climates (Zones 8-10):

Disease Resistance Considerations

Training Systems

Understanding Vine Anatomy

Key terms:

High Cordon (High Bilateral Cordon)

Setup:

• Single wire at 6 feet
• Cordons trained along wire
• Shoots grow downward

Advantages:

• Good for vigorous varieties
• Easy to manage
• Good air circulation

Pruning: Spur pruning (2-3 buds per spur)

Vertical Shoot Positioning (VSP)

Setup:

• Fruiting wire at 3 feet
• 2-3 catch wires above
• Shoots trained upward between wires

Advantages:

• Excellent fruit exposure
• Professional appearance
• Popular for wine grapes

Pruning: Cane or spur pruning

Four-Arm Kniffin

Setup:

• Two wires at 3 and 6 feet
• Two canes trained each direction on each wire
• Total 4 fruiting canes

Advantages:

• Simple; good for beginners
• Works well with American types
• High production

Pruning: Cane pruning (8-12 buds per cane)

Geneva Double Curtain (GDC)

Setup:

• Two wires 4 feet apart at 6 feet height
• Cordons split onto both wires
• Shoots drape downward

Advantages:

• Doubles fruiting area
• Good for vigorous sites
• High yields

Pruning: Spur pruning

Canopy Management

Why Canopy Management Matters

Benefits of good canopy:

• Improved fruit ripening
• Reduced disease pressure
• Better spray penetration
• Enhanced flavor development

Shoot Positioning

Early season (spring):

1. Position shoots in proper direction
2. Tuck into catch wires (VSP)
3. Remove poorly positioned shoots
4. Space shoots 3-4 inches apart

Leaf Removal

When: After fruit set, before veraison

In the fruit zone:

1. Remove leaves on morning sun side first
2. Gradually expose fruit
3. Don't remove all leaves (sunburn risk)
4. Improves color in red varieties

Shoot Thinning

Remove:

• Double shoots from same bud
• Shoots without clusters
• Weak shoots
• Shoots crowding the canopy

Target: 4-6 shoots per foot of cordon

Cluster Thinning

Purpose: Balance crop load with vine capacity

Guidelines:

• Young vines: 1 cluster per shoot maximum
• Mature vines: 1-2 clusters per shoot
• Remove second cluster if vine is stressed
• Thin early (shortly after fruit set)

Fertility Management

Soil Fertility

Annual soil testing:

• Test every 2-3 years
• Adjust pH if needed
• Monitor potassium (critical for grapes)

Nutrient Requirements

Fertilization Schedule

Important: Avoid over-fertilizing. Excessive vigor causes disease problems and poor fruit quality.

Disease Management

Integrated Disease Management

Cultural practices:

• Site selection (air circulation)
• Resistant varieties
• Canopy management
• Sanitation (remove mummies, infected tissue)

Spray Program Basics

Critical timing:

1. Pre-bloom: Protect new growth
2. Bloom: Critical for fruit protection
3. Post-bloom through veraison: Maintain protection
4. Post-harvest: Protect leaves for winter hardiness

Common Fungicides

Resistance Management

• Rotate fungicide classes
• Don't rely on one product
• Tank mix when appropriate

Pest Management

Grape Berry Moth

Japanese Beetles

Birds

Propagation

Hardwood Cuttings

When: Late winter (dormant)

Process:

1. Select 1-year-old canes (pencil diameter)
2. Cut 12-18 inch sections with 3-4 buds
3. Bundle; bury in moist sand/sawdust
4. Plant in spring; one bud above soil
5. Roots develop in first season

Layering

When: Spring

Process:

1. Bend low cane to ground
2. Bury middle section 4-6 inches deep
3. Keep tip exposed
4. Roots form at buried nodes
5. Sever and transplant following year

Record Keeping

Track annually:

• Pruning weights
• Yield per vine
• Disease/pest occurrences
• Spray dates
• Harvest dates and quality
• Weather notes

Conclusion

Successful grape growing at the intermediate level requires understanding training systems, implementing proper canopy management, and maintaining a proactive disease control program. The investment in proper training and management pays dividends in fruit quality and vine longevity.

Ready for more? Our Advanced Guide covers precision viticulture, commercial production, and intensive management techniques.