Cilantro

Choosing & planning

What is cilantro and where does it grow best?

Cilantro (Coriandrum sativum) is a fast-growing annual herb native to the Mediterranean Basin and parts of Western Asia and Northern Africa, prized for its bright, citrusy leaves and aromatic seeds called coriander. It is a cool-season plant that grows best when temperatures stay between 50–85°F (10–29°C). It thrives in spring and fall in most climates, and in mild-winter regions it can be grown through winter.

What are the main types of cilantro, and how do they differ?

Cilantro is a fairly uniform herb with few noticeable differences between most cultivated varieties. Specialist types include ‘Confetti’ and ‘Criollo’, which have fern-like foliage, and purple cilantro, which has purple-tinged stems. Vietnamese cilantro is a different plant but can be used as a heat-tolerant substitute.

Which cilantro varieties are recommended, and how do I choose one?

For leaf harvest, choose slow-bolting varieties such as ‘Santo’, ‘Slow Bolt’, ‘Leisure’, ‘Calypso’, ‘Costa Rica’, and ‘Long Standing’. ‘Santo’ is the most commonly available and is reliable with great flavor. For seed (coriander) production, standard varieties work well.

Can I grow cilantro in my climate or hardiness zone?

Cilantro can be grown across USDA Zones 2–11. In Zones 8 and above it can be grown in winter with some care. In tropical climates (Zones 10–11) it grows best in fall and winter, and bolting must be managed with shade during warmer months.

Can I grow cilantro in containers or pots, and what size do they need?

Yes, cilantro grows well in containers. Choose a pot at least 12 inches deep to accommodate the taproot, with a width of at least 8–10 inches; 18–20 inches wide is ideal for fuller growth. Drainage holes are essential to prevent waterlogging and root rot.

Can I grow cilantro indoors or in a greenhouse?

Yes, cilantro can be grown indoors. In cooler regions below Zone 8b, growing indoors, in cold frames, or in hothouses allows production through winter. Use a bright south-facing window and a pot at least 12 inches deep, and avoid transplanting seedlings once established.

Starting from seed & propagation

Should I start cilantro from seed or buy transplants?

Start cilantro from seed — direct sowing is strongly recommended because cilantro has a long taproot that does not transplant well. Nursery transplants also tend to bolt more quickly than plants grown from seed.

When should I start cilantro seeds indoors?

Sow cilantro as soon as the soil is workable in spring, approximately 60 days before your last frost date. For a fall crop, start sowing about 60 days before your first fall frost once temperatures drop below 80°F. For many zones, April is a good spring target and late August is a useful second window.

How deep should I sow cilantro seeds?

Sow cilantro seeds 1/4 to 1/2 inch (6–12 mm) deep. The seeds germinate in the dark, so a light but consistent soil covering is important.

What temperature do cilantro seeds need to germinate?

Cilantro seeds germinate best at soil temperatures of 55–70°F (13–21°C). If soil is too cold seeds may rot before sprouting; if too hot, plants may bolt early and produce poor leaf growth.

How long do cilantro seeds take to germinate?

Cilantro seeds typically germinate in 7–14 days under optimal conditions of 65–70°F. Some sources report germination as fast as 5–7 days in consistently warm, moist soil.

Why are my cilantro seedlings leggy or weak?

Leggy seedlings are most often caused by insufficient light. Indoor cilantro in winter is especially prone to stretching toward inadequate light, resulting in fewer and weaker leaves. Leggy plants are also more likely to bolt early than compact, well-lit ones.

Site, soil & timing

How much sun does cilantro need?

Cilantro grows best in full sun but tolerates partial shade, especially in hot climates where afternoon shade helps delay bolting. It needs at least 4–6 hours of direct sunlight per day for healthy leaf production.

What type of soil does cilantro prefer?

Cilantro thrives in loose, well-draining, loamy soil rich in organic matter. Heavy clay or compacted soils that retain excess moisture should be avoided because they promote root rot.

What soil pH does cilantro need?

Cilantro prefers slightly acidic to neutral soil with a pH of 6.2 to 6.8. This range allows the plant to access the nutrients it needs for healthy growth.

How should I prepare and amend the soil for cilantro?

Before planting, mix in aged compost or organic matter to improve fertility and drainage. For heavy clay soils, add coarse sand alongside compost to break up density. A soil test helps identify specific nutrient gaps so amendments can be targeted.

When should I plant cilantro outdoors?

Plant cilantro outdoors in spring starting about 60 days before the last frost date, and again in fall about 60 days before the first frost once temperatures are below 80°F. In mild-winter climates (Zone 8+), cilantro can be grown through the winter months.

Does cilantro tolerate frost, heat, or drought?

Established cilantro can survive temperatures down to 20°F; leaves may freeze but the plant can regrow. Young plants should be covered with frost cloth or brought inside during hard freezes. Cilantro does not tolerate heat well — when soil temperatures climb above 75°F or day length exceeds 12–14 hours, the plant bolts rapidly and stops producing quality leaves.

Planting

How far apart should I space cilantro plants?

For leaf harvest, sow seeds 1/4–1/2 inch apart and thin to 3–6 inches as plants grow. For coriander seed production, thin to 2–4 inches apart. In containers, 3–4 inches between plants provides optimum growth.

How far apart should the rows be?

Space rows 12–15 inches apart for in-ground growing. For intensive leaf production, rows as close as 3 inches apart can work since cilantro continues to grow well when sown thickly.

How deep should I plant cilantro?

Plant cilantro seeds 1/4 to 1/2 inch deep. Coverage is necessary because the seeds germinate in the dark.

Are there special planting techniques for cilantro?

Direct sowing into the final growing location is strongly preferred over transplanting, because cilantro’s long taproot is easily damaged. Before sowing, gently crack or split the round seed husk — it contains two seeds — to improve germination rates. Succession planting every 1–3 weeks ensures a continuous leaf harvest throughout the season.

What grows well next to cilantro (companion plants)?

Good companions include beans, peas, and lupines (which fix nitrogen and cast shade), anise (which deters aphids and may boost germination), sweet alyssum (which attracts predatory insects like ladybugs and lacewings), sunflowers (which provide cooling shade), brassicas, lettuce, dill, parsley, basil, and chervil. Cilantro’s flowers attract beneficial insects including parasitic wasps and hoverflies that control common garden pests.

What should I avoid planting near cilantro?

Avoid planting fennel near cilantro because it releases allelopathic chemicals that reduce cilantro’s germination rate. Aggressively spreading herbs like mint and oregano compete with cilantro’s shallow taproot for nutrients. Dill planted too close can cross-pollinate with cilantro and alter its flavor.

Watering

How much and how often should I water cilantro?

Cilantro needs consistently moist but never waterlogged soil. Water when the top inch of soil feels dry. In very dry or hot climates, watering twice a week may be necessary to maintain even soil moisture.

What is the best way to water cilantro?

Water at the base of the plant and avoid wetting the foliage, which promotes powdery mildew. Use a watering can with a fine spout or a spray bottle for young seedlings to avoid disturbing the soil. Watering in the morning allows foliage that does get wet to dry quickly, reducing fungal disease risk.

What are the signs of over- or under-watering cilantro?

Both overwatering and underwatering cause wilting. Overwatered plants may also show yellowing leaves, persistently wet soil, and a foul smell indicating root rot. Underwatered plants lose stem stiffness and turgor; pressing a finger a few inches into the soil and finding it completely dry confirms underwatering.

Feeding & fertilizing

How should I fertilize cilantro?

Cilantro is a light feeder — apply a balanced or slightly nitrogen-rich fertilizer monthly. Organic options such as compost, fish emulsion, or aged manure work well and improve soil health over time. Over-fertilizing causes leggy growth and diminished flavor, so apply sparingly.

What fertilizer or nutrients does cilantro need?

Cilantro primarily needs nitrogen for leafy green growth, phosphorus for root development, and potassium for overall plant health. Soil rich in organic matter typically provides a sufficient balanced supply without heavy synthetic feeding.

When and how often should I feed cilantro?

Fertilize at least once after seedlings are established and growing, then roughly monthly during the season. A general-purpose water-soluble fertilizer applied monthly is sufficient; slow-release organic options like fish emulsion or compost can reduce the frequency needed.

What are the signs of nutrient deficiency in cilantro?

Uniform pale yellowing of lower leaves with new growth remaining green is the classic sign of nitrogen deficiency. More severe deficiency causes general yellowing, wilting, and eventual plant death. Container-grown cilantro is especially prone to nutrient depletion.

Support, training & pruning

Should I prune, train, or remove suckers from cilantro?

Regular pruning is beneficial and delays bolting. Use clean scissors to snip the outermost stems about one-third of the way down every two to three weeks once the plant is 4–6 inches tall, being careful not to cut the central growing point. Pinching back developing flower buds keeps the plant focused on leaf production and extends the harvest window.

Pests

What pests commonly attack cilantro?

Common pests include aphids, spider mites, cabbage worms (larvae of the cabbage white butterfly), leafminers, and armyworms. Aphids are among the most frequent and troublesome problems and can also spread viral diseases.

How do I identify cilantro pest damage?

Aphids cluster on new growth and leaf undersides, causing stunted, distorted, or yellowing leaves and leaving sticky honeydew residue that promotes sooty mold. Spider mites leave fine webbing between leaves and stems with stippled or bronzed leaf surfaces. Cabbage worms create irregular, ragged holes in leaves. Leafminers tunnel inside leaf tissue, leaving distinctive serpentine trails or blotches visible from outside the leaf.

How do I prevent cilantro pests?

Keep plants healthy through proper watering and fertilization, as vigorous plants resist pest attacks better. Harvest promptly — leaving cilantro in the garden past its prime increases pest attraction. Companion planting with anise and chervil can help deter insects.

How do I control cilantro pests organically and chemically?

Blast aphids and spider mites off with a firm stream of water in the morning. Hand-pick cabbage worms into soapy water. Insecticidal soap (1 tsp mild dish soap plus 1 tsp oil per half-gallon water) kills soft-bodied insects on contact when sprayed on affected areas including leaf undersides. Neem oil disrupts insect feeding and growth for a range of soft-bodied pests. Food-grade diatomaceous earth dusted on foliage or around the base dehydrates crawling insects. For armyworms, apply Bacillus thuringiensis (Bt) to young larvae.

Diseases

What diseases commonly affect cilantro?

Common diseases include root rot from overwatering, damping-off caused by Pythium or Rhizoctonia fungi, Fusarium wilt, soft rot, Coriander blight, Carrot Motley Dwarf virus (spread by aphids), and Cilantro Yellow Blotch virus.

How do I recognize cilantro disease symptoms?

Root rot presents with yellowing leaves, wet soil, and a possible foul smell. Damping-off causes seedlings to collapse at the soil line. Fusarium wilt causes wilting that does not recover overnight along with stem discoloration. Carrot Motley Dwarf virus shows as yellow and red foliage with stunted plants. Cilantro Yellow Blotch virus produces bright, irregular yellow blotches with diffuse margins. Bacterial diseases such as soft rot and Coriander blight produce water-soaked lesions on affected plant parts.

How do I prevent cilantro diseases?

Ensure good soil drainage and avoid overwatering to prevent root rot and damping-off. Increase airflow around plants and reduce overhead watering. Avoid reusing old compacted compost from diseased pots for new seedlings. Control aphid populations to limit the spread of viral diseases.

How do I treat or manage cilantro diseases?

For root rot, stop watering immediately, improve drainage, and inspect the crown for damage. For Fusarium wilt, remove affected plants and do not plant any Apiaceae family crops in that spot for 4–6 years. For Carrot Motley Dwarf and Yellow Blotch viruses, remove infected plants promptly and control aphid populations; no confirmed spray treatment exists for these viruses.

Disorders & troubleshooting

Why are my cilantro leaves yellowing, curling, or spotted?

Uniform pale yellowing on lower leaves with green new growth signals nitrogen deficiency. Yellow leaves combined with wet soil and a foul smell indicate root rot from overwatering. Yellow and red foliage with stunting suggests Carrot Motley Dwarf virus spread by aphids. Bright irregular yellow blotches with diffuse margins indicate Cilantro Yellow Blotch virus. Aphid feeding can also cause general leaf distortion and yellowing.

Why is my cilantro not growing or producing well?

The most common cause is heat-triggered bolting — once temperatures exceed 75°F or day length exceeds 12–14 hours, cilantro shifts to seed production, making leaves feathery and bitter. Other causes include insufficient light (especially indoors), nitrogen deficiency causing pale weak growth, overwatering causing root rot, pest and virus damage, and leggy growth from poor light reducing overall leaf yield.

Harvest

How long does cilantro take to mature?

Cilantro leaves can be harvested in as little as 3–4 weeks from sowing. Full leaf maturity is reached in 45–70 days depending on variety and growing conditions. Coriander seeds mature approximately 90–120 days after planting.

How do I know when cilantro is ready to harvest?

Cilantro is ready to harvest once plants are about 4–6 inches tall with several healthy, established leaves — typically 3–4 weeks after sowing. Harvest before the plant bolts and flowers, as leaves become bitter and feathery once bolting begins.

How do I harvest cilantro correctly?

Using scissors, snip whole outer stems at the base of the plant, working from the outside in since outer stems are oldest. For a full harvest, cut the entire plant about 3 inches above ground level. Avoid cutting the central growing point so the plant can continue producing.

How often should I harvest cilantro?

Harvest as often as you need to, ideally every 2–3 weeks. Take no more than one-third of the plant at a time under normal conditions; if you remove more than 50%, allow 7–10 days for the plant to recover before harvesting again. Regular harvesting actively delays bolting and encourages bushier growth.

Storage, preservation & seed saving

How should I store fresh cilantro, and how long does it keep?

Place cilantro stems upright in a glass or jar with about one inch of water, loosely cover the leaves with a plastic bag, and refrigerate for up to one month, replacing water as needed. Alternatively, lay cilantro in a single layer on paper towels, roll them up, place in a zip-close bag, and refrigerate for up to two weeks.

How can I preserve cilantro (canning, freezing, or drying)?

To freeze: briefly blanch cilantro in boiling water, plunge into an ice bath, dry, blend leaves with a little olive oil into a paste, and freeze in ice cube trays for up to 6 months. To dry: spread leaves on a parchment-lined baking sheet and bake at 250°F for about 30 minutes until dry and crumbly, then store in an airtight container for up to 3 years. Note that dried cilantro loses most of its fresh flavor compared to the frozen method.

How do I save seeds from cilantro for next year?

Allow a few plants to flower and set seed fully. Cut the seed heads over a paper bag when they are just ripe but before seeds begin to fall on their own. Dry and store the seeds for planting next season, or use them as the culinary spice coriander.

Uses & nutrition

What is cilantro commonly used for in cooking?

Cilantro leaves are a staple in Mexican, South American, Indian, Chinese, Thai, Middle Eastern, and Mediterranean cuisines. They are commonly added fresh to salsas, curries, chutneys, tacos, rice dishes, and salads, or used as a garnish. The dried seeds (coriander) are a widely used culinary spice.

Season extension & regional growing

How can I extend the cilantro growing season?

Succession plant every 1–3 weeks throughout the season to ensure a continuous supply of fresh leaves. In warm weather, providing afternoon shade delays the heat-triggered bolting response. Regular harvesting of outer stems also slows the plant’s transition to flowering.

Can I grow a fall or second crop of cilantro?

Yes. Sow seeds again about 60 days before the first fall frost, once temperatures drop below 80°F. In mild climates, 2–3 cilantro cycles per season are possible. In Central Texas, for example, September/October and February sowings both yield viable harvests.

How do I grow cilantro in a particularly hot or cold region?

In hot climates (Zones 10–11), grow cilantro in fall and winter when temperatures are naturally cooler, and provide afternoon shade during transitional warm periods to slow bolting. In cold regions, grow in containers so plants can be moved indoors before hard freezes; established plants can survive down to 20°F but young seedlings are more vulnerable. Cold frames and hothouses extend the season in cooler zones.