Currant Cultivation: Intermediate Growing Techniques

Advanced Currant Growing

Building on basic currant knowledge, this intermediate guide explores the taxonomic differences between currant types, advanced propagation techniques, comprehensive disease management, and processing methods to maximize your currant harvest.

Understanding Currant Taxonomy

The genus Ribes is the sole genus in family Grossulariaceae, containing approximately 200 species.

Taxonomic Classification

Infrageneric Classification

Species Relationships

Molecular analysis confirmed:

• Black, red, and white currants are distinct taxa at the same level
• Gooseberries form a separate subgenus
• Native American species (R. odoratum, R. aureum) are more distant

Key Cultivated Species

Black Currants (Section Coreosma):

Red Currants (Section Ribes):

Variety Selection by Purpose

Processing Varieties

Fresh Eating Varieties

Disease-Resistant Varieties

Propagation Techniques

Hardwood Cuttings (Most Reliable)

Timing: Late fall to early winter (dormant)

Process:

1. Select healthy 1-year-old shoots
2. Cut 6-10 inch sections with 4+ buds
3. Make bottom cut just below a bud (45° angle)
4. Make top cut just above a bud (straight)
5. Bundle and store in moist sand at 35-40°F
6. Or plant immediately in prepared bed
7. Insert with 2-3 buds above soil line

Success rate: 70-90% for currants

Softwood Cuttings

Timing: Late spring/early summer

Process:

1. Take 4-6 inch cuttings of current growth
2. Remove lower leaves
3. Dip in rooting hormone (IBA 1000-3000 ppm)
4. Plant in sterile medium
5. Maintain high humidity
6. Bottom heat helps (70-75°F)
7. Root in 4-6 weeks

Layering

Mound layering:

1. In early spring, mound soil 6-8 inches over base
2. New shoots develop roots where covered
3. Separate rooted shoots in fall
4. Transplant immediately

Simple layering:

1. Bend low branch to ground
2. Bury middle section 3-4 inches deep
3. Stake tip upright
4. Sever from parent after one year

Advanced Pruning Systems

Understanding Fruiting Habits

Red/White Currant Pruning System

Goal: Maintain 9-12 canes total (3-4 of each age class)

Annual process:

1. Remove all 4+ year old canes at base
2. Remove weak, crossing, or damaged canes
3. Keep 3-4 best new shoots from base
4. Head back leaders by 1/3
5. Reduce laterals to 2-3 buds
6. Maintain open, vase-shaped center

Black Currant Pruning Options

Option 1: Stool system

• Remove all fruited canes after harvest
• Keep 8-10 new shoots annually
• Simplest method, slightly lower yields

Option 2: Replacement system

• Keep 10-12 canes total
• Remove oldest 1/3 annually
• Higher sustained yields

Option 3: Hedge system (commercial)

• Mechanical hedging
• Annual top removal to 3-4 feet
• Side trimming to row width

White Pine Blister Rust Management

Disease Cycle Understanding

White pine blister rust (Cronartium ribicola) requires two hosts:

Spores cannot spread pine-to-pine—Ribes is essential for completion.

Risk Assessment

Management Strategies

1. Plant resistant varieties: Consort, Crusader, Titania
2. Maintain distance: 900+ feet from white pines
3. Remove alternate host: If pines more valuable
4. Scout and remove: Infected Ribes leaves
5. Site selection: Avoid pine forest edges

Integrated Pest Management

Major Pest Complex

Currant Sawfly (Nematus ribesii):

• Larvae defoliate plants rapidly
• Multiple generations per year
• Eggs on leaf undersides

Management:

• Scout in late spring
• Hand pick small infestations
• Spinosad for severe cases
• Encourage parasitic wasps

Currant Aphid (Cryptomyzus ribis):

• Causes severe leaf curling
• Overwinters on Ribes
• Multiple summer generations

Management:

• Dormant oil spray
• Remove curled leaves
• Encourage ladybugs
• Insecticidal soap if needed

Imported Currantworm:

• Similar to sawfly
• Green larvae with black spots
• Feed on edges of leaves

Management:

• Similar to sawfly
• Bacillus thuringiensis (Bt) effective on young larvae

Disease Management

Powdery Mildew:

• White coating on leaves and shoots
• Worse in humid, shaded conditions
• Can affect fruit quality

Management:

• Improve air circulation (pruning, spacing)
• Avoid overhead irrigation
• Potassium bicarbonate sprays
• Sulfur (not on sulfur-sensitive varieties)

Anthracnose Leaf Spot:

• Brown spots, premature defoliation
• Reduces plant vigor over time

Management:

• Remove fallen leaves
• Improve air circulation
• Copper spray in early spring

Harvest and Post-Harvest

Maturity Indicators

Harvest Methods

Hand harvest:

• Fastest for small plantings
• Harvest entire strigs (clusters)
• Use scissors for clean cuts
• Handle gently to prevent crushing

Mechanical assist:

• Shaking into tarps
• Over-the-row harvesters
• Better suited to black currants

Storage Conditions

Processing Basics

Juice Extraction

Cold press method:

1. Crush berries gently
2. Add small amount of water
3. Press or strain through cloth
4. Pasteurize (180°F/10 min)
5. Store refrigerated or can

Steam extraction:

1. Use steam juicer
2. No crushing needed
3. Higher yields from black currants
4. Automatically pasteurizes

Jam and Jelly

Red currants are naturally high in pectin—ideal for making jelly.

Yield Optimization

Troubleshooting Advanced Issues

Next Steps

1. Experiment with multiple varieties
2. Master propagation for expansion
3. Develop IPM monitoring schedule
4. Learn processing techniques
5. Consider small-scale sales

Understanding currants at this level prepares you for advanced production.