Intermediate Cilantro Growing: Succession Planting and Season Extension

Beyond Basic Cilantro Growing

You've mastered the fundamentals of growing cilantro—now it's time to develop strategies for consistent, abundant harvests throughout the growing season. This guide covers succession planting, variety selection, season extension, and understanding the science behind bolting.

The Science of Cilantro Growth

Understanding the Plant's Life Cycle

Cilantro is a cool-season annual with a programmed life cycle:

1. Vegetative Phase: Leaf production (desirable)
2. Reproductive Phase: Bolting, flowering, seeding (ends leaf harvest)

The transition from vegetative to reproductive phase is triggered by:

Science Note: Cilantro exhibits long-day photoperiodism, meaning it flowers in response to day lengths exceeding 12-13 hours. This is why spring plantings bolt faster than fall plantings in temperate climates.

Growth Rate by Season

Mastering Succession Planting

The Basic Concept

Succession planting means sowing new seeds at regular intervals to ensure continuous harvest. For cilantro, this is essential because individual plantings have limited harvest windows.

Optimal Succession Schedule

Spring Strategy (March-May):

• Sow every 2 weeks
• Use slowest-bolting varieties
• Plan for bolting by early summer

Fall Strategy (August-October):

• Sow every 3-4 weeks
• Best production period
• Plants may overwinter in mild climates

Sample Succession Calendar (Zone 7)

Variety Deep-Dive

Slow-Bolt Varieties Compared

Specialty Varieties

Delfino Cilantro:

• Lacy, fern-like leaves
• Slower to bolt than standard types
• Beautiful garnish
• Milder flavor

Culantro (Eryngium foetidum):

• Different species but similar flavor
• Much more heat tolerant
• Perennial in zones 9-11
• Also called "recao" or "Mexican coriander"

Pro Tip: Growing culantro alongside cilantro gives you heat-tolerant backup when your cilantro bolts in summer.

Season Extension Techniques

Spring: Getting an Early Start

Indoor Sowing (6-8 weeks before last frost):

• Use deep pots (minimum 6 inches) to accommodate taproot
• Keep at 55-65°F for best germination
• Transplant carefully to avoid root disturbance
• Harden off for 1 week before planting out

Cold Frame Growing:

• Start seeds directly in cold frame
• Provides 10-15°F temperature increase
• Protects from late frosts
• Allows earlier sowing by 4-6 weeks

Summer: Beating the Heat

Shade Cloth Strategy:

• Use 30-40% shade cloth
• Reduces soil temperature by 10-15°F
• Extends harvest by 1-2 weeks
• Install when temps regularly exceed 75°F

Microclimate Selection:

• Plant on north side of taller crops
• Use east-facing beds (morning sun only)
• Mulch heavily to keep roots cool

Container Strategy:

• Move containers to shaded areas
• Use white or light-colored pots
• Add mulch to container surface

Fall: Extending the Harvest

Row Covers:

• Protect from light frosts
• Add 4-8°F of protection
• Allow continued growth into November

Overwintering (Zones 7+):

• Heavy mulch after frost
• Plants often survive mild winters
• Spring regrowth produces early harvest
• Will bolt quickly in spring (harvest fast!)

Managing Bolting

Early Signs of Bolting

1. Center stem begins elongating
2. Leaves become more feathery/lacy
3. Lower leaves may yellow
4. Growth habit changes from bushy to vertical

What to Do When Plants Bolt

Option 1: Harvest Immediately

• Cut all usable leaves
• Stems have good flavor too
• Use for cilantro oil or pesto

Option 2: Let Plants Go to Seed

• Flowers attract beneficial insects
• Harvest coriander seeds
• Allow self-seeding for next generation

Option 3: Remove Flower Stalks

• Can delay bolting briefly
• Usually only gains 1-2 weeks
• Quality of new leaves decreases

Flowering Cilantro Uses

Soil and Fertility Management

Ideal Soil Composition

Cilantro performs best in:

• Texture: Sandy loam to loam
• pH: 6.2-6.8
• Organic matter: 3-5%
• Drainage: Excellent (no standing water)

Fertilization Schedule

Warning: Excess nitrogen can cause lush growth but reduced flavor compounds. Stop fertilizing if plants show signs of bolting.

Companion Planting for Cilantro

Beneficial Companions

Plants to Avoid

Harvesting for Maximum Yield

Cut-and-Come-Again Method

1. Wait until plants have at least 6 true leaves
2. Cut outer stems at soil level
3. Leave center growing point intact
4. Plant regrows in 2-3 weeks
5. Repeat 2-3 times per planting

Whole Plant Harvest

Best for:

• End of season
• Plants showing bolting signs
• When you need large quantities

Method:

1. Cut 1-2 inches above soil
2. Roots may regrow (sometimes)
3. Usually one final harvest

Harvest Timing

• Best time: Early morning after dew dries
• Avoid: Afternoon heat (wilts quickly)
• Frequency: Every 3-5 days during peak growth

Troubleshooting Guide

Problem: Poor Germination

Problem: Plants Bolt Immediately

Problem: Weak Flavor

Record Keeping

Track these variables to improve your success:

Next Steps

Ready for advanced techniques? The next level covers:

1. Seed saving and variety improvement
2. Hydroponic cilantro production
3. Commercial-scale succession systems
4. Integrated pest management
5. Essential oil chemistry

You're now equipped to grow cilantro successfully through multiple seasons with strategic planning and variety selection!