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How to Grow Cilantro

Cilantro is a fast-growing, cool-season herb that frustrates many gardeners with its tendency to bolt (go to seed) quickly. But once you understand that cilantro is designed to complete its lifecycle rapidly, you can work with it rather than against it. The secret is succession planting - sowing new seeds every few weeks for continuous harvests. As a bonus, when cilantro does bolt, the seeds become coriander, a valuable spice. This guide covers both cilantro leaf production and coriander seed harvesting.

Difficulty:Moderate (bolting)

Time to Harvest:21-28 days

Sun Needs:4-6 hours (partial shade OK)

The Truth About Cilantro Bolting

Cilantro will bolt. Accept it. This is not a failure - it's cilantro's natural lifecycle. Cilantro is programmed to complete its entire life cycle (germinate, grow, flower, seed) in 6-8 weeks. In hot weather, this can happen in as little as 3-4 weeks.

The solution is not to fight bolting but to plan for it: succession plant every 2-3 weeks, and enjoy coriander seeds when bolting occurs. Many experienced gardeners plant cilantro monthly and consider coriander seed harvest a bonus crop.

Quick Facts

Botanical Name: Coriandrum sativum

Plant Type: Cool-season annual

Seed Depth: 1/4 inch

Germination: 7-10 days (soak seeds)

Days to Harvest: 21-28 days (leaves)

Plant Spacing: 6-8 inches (or clusters)

Container Size: 8+ inches deep

Seeds to Coriander: 90-100 days

Best Slow-Bolt Varieties

Calypso

Most bolt-resistant variety. Bred specifically for leaf production. 2-3 weeks slower to bolt than standard types. Best choice for summer growing.

Santo/Slow Bolt

Good bolt resistance with classic cilantro flavor. Produces abundant foliage. Widely available. Good for spring and fall crops.

Leisure

Very slow to bolt. Larger leaves than other varieties. Excellent for hot climates. Strong flavor.

Container Growing Guide

Cilantro grows well in containers, which makes succession planting easy - just start new pots every few weeks.

Container Requirements

Depth: At least 8 inches (taproot)
Width: 10-12 inches for cluster planting
Material: Any with drainage holes
Soil: Standard potting mix

Container Tips

Move containers to afternoon shade in hot weather
Water daily in summer - dry soil triggers bolting
Grow multiple containers in rotation
Light-colored containers stay cooler

Harvesting Coriander Seeds

When cilantro bolts, let it flower and set seed. The seeds are coriander - a versatile spice used in cuisines worldwide.

Wait for seeds to brown: Let seeds dry on the plant until they turn tan/brown and are hard. This takes 2-3 weeks after flowering.

Harvest seed heads: Cut entire seed heads into a paper bag. Shake to release seeds. Some seeds may fall before harvest - this is self-sowing for next year.

Dry and store: Spread seeds on a screen to dry fully for 1-2 weeks. Store in airtight container. Seeds remain viable for 2+ years and can be planted or used as spice.

Common Problems

Premature Bolting

Cause: Heat, long days, water stress, or transplant shock

Solution: Plant in cool seasons only. Use slow-bolt varieties. Provide afternoon shade. Water consistently. Never transplant - direct sow only. Succession plant for reliable supply.

Slow Germination

Cause: Cilantro seeds have hard coating

Solution: Soak seeds overnight before planting. Gently crush seed coat (it's actually two seeds fused together). Keep soil moist during germination. Be patient - can take 7-14 days.

Yellow Leaves

Cause: Overwatering, nitrogen deficiency, or natural aging

Solution: Improve drainage. Apply balanced fertilizer. Remove yellow outer leaves - some loss is normal especially in older plants.

Powdery Mildew

Cause: Poor air circulation and humidity

Solution: Space plants adequately. Water at soil level. Improve airflow. Remove affected leaves. Usually not fatal to cilantro.

FAQ

Why does cilantro bolt so fast?

Cilantro is extremely sensitive to heat and long days. It bolts (goes to seed) when temperatures exceed 75F or day length passes 12 hours. This is natural - cilantro is a cool-season crop that completes its lifecycle quickly. The solution is succession planting and growing in spring/fall.

Can you eat cilantro after it bolts?

Yes! The flowers are edible with a milder cilantro flavor - great as garnish. Once seeds form (coriander), let them dry on the plant, then harvest. Coriander seeds are a valuable spice. Bolted stems are too tough to eat, but nothing is wasted.

How do I prevent cilantro from bolting?

You can't completely prevent bolting, but you can delay it: plant slow-bolt varieties (Calypso, Santo, Slow Bolt), provide afternoon shade, keep soil cool with mulch, water consistently, and harvest frequently. Most importantly, succession plant every 2-3 weeks.

Should I grow cilantro from seed or transplant?

Always grow cilantro from seed - it has a taproot that doesn't transplant well. Direct sow seeds where they'll grow. Seeds are large and easy to handle. Don't thin aggressively - cilantro grows well in clusters. Soak seeds overnight to speed germination.

How do I harvest cilantro without killing the plant?

Harvest outer stems at the base, leaving the center growing point intact. Never take more than 1/3 of the plant at once. Cut whole stems rather than individual leaves. Regular harvesting delays bolting. Once the flower stalk appears, harvest everything - the plant is ending its cycle.

Can cilantro grow indoors?

Cilantro is challenging indoors because it needs cool temperatures (50-70F) and bolts quickly under warm conditions. If attempting: use a cool room, provide 6+ hours of light, and accept shorter harvests. Many gardeners find it easier to grow cilantro outdoors and bring leaves inside.

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