Slow-Bolt Cilantro

A cilantro cultivar specifically bred to resist bolting in warm weather, extending the leaf harvest by several weeks. Slow-bolt varieties produce more foliage before flowering, giving gardeners in hot climates a reliable cilantro supply. Still prefers cool conditions but tolerates heat much better than standard cilantro varieties.

Direct sow slow-bolt cilantro seeds outdoors 2-3 weeks before the last frost date. Gently crush the round seed husks between your palms to split them, as each husk contains two seeds. Sow 1/4 inch deep, spacing seeds 1-2 inches apart in rows or broadcast in patches. Keep soil moist during the 7-14 day germination period. Thin seedlings to 4-6 inches apart. For fall harvest, sow again 6-8 weeks before the first expected frost. Indoor starting is possible but not ideal due to cilantro's sensitive taproot.

The Season Plate

Your Slow-Bolt Cilantro Year

Composed for Zone 7 · typical seasons · frost passes Apr 2, returns Nov 1

Sow Slow-Bolt Cilantro Mar – May, Sep – Oct, pick May – Jul, Oct – Nov. Set your climate below and every date on this plate re-times itself.

Sowing window

Mar – May, Sep – Oct

re-timed to your frost dates

Plant out

after Apr 2

once frost risk has passed

First picking

around May 4

≈ 50 days from sowing · 30-60g per plant

Composed for —ColdTemperateMildWarmUse my locationUsed once to set your season · only the zone is kept

Week-by-week Slow-Bolt Cilantro reminders watering, feeding and pruning, timed to your dates

In the app

Frost alerts for your garden a warning before a cold night costs you the crop

In the app

Succession sowing dates so the picking never gaps mid-season

In the app

Keep my dates — free for 7 daysWe nudge you as each window opens · cancel anytime

Slow-bolt cilantro varieties are bred to extend the leaf harvest window by resisting premature flowering in warm weather. Direct sow seeds outdoors 2-3 weeks before the last frost date, as cilantro germinates well in cool soil. Lightly crush the round seed hulls before planting to speed germination. Sow 1/4 inch deep and keep soil moist. Seeds germinate in 7-14 days at 55-65°F.

Plant in partial shade to keep roots cool, especially in warm climates. Space plants 4-6 inches apart in rows 12 inches apart, or broadcast thickly for a dense patch. Cilantro has a taproot and does not transplant well, so always direct sow where it will grow. Mulch around plants to keep roots cool and retain moisture.

Even slow-bolt varieties will eventually flower when temperatures consistently exceed 80°F. Succession sow every 2-3 weeks from early spring through fall to maintain a continuous supply. In hot climates, plant in early spring and again in late summer for fall harvest. Once plants bolt, allow some to set seed for coriander harvest or self-sowing.

Cilantro is a valuable companion plant that attracts beneficial insects including parasitic wasps, hoverflies, and tachinid flies when allowed to flower. Plant near spinach and lettuce, as cilantro provides light shade and its flowers attract pollinators. Grow alongside peas and beans for mutual benefit. Avoid planting near fennel, which can cross-pollinate with cilantro and inhibit growth. Cilantro planted near tomatoes may help repel spider mites and aphids.

The Society Table

Spinach belongs beside it. Fennel doesn't.

Old growers' knowledge, checked against Slow-Bolt Cilantro's real companion table below — test any plant you're growing.

Grows well in the company of · 3

SpinachPeasLettuce

Keep apart · 1

Fennel

Plant Slow-Bolt Cilantro with good neighboursThe planner flags conflicts before they're in the ground

Slow-bolt cilantro grows best in fertile, well-drained soil with a pH of 6.2-6.8. Amend beds with 2-3 inches of compost before planting. Cilantro is a moderate feeder; apply a balanced liquid fertilizer every 3-4 weeks or side-dress with compost. Avoid heavy nitrogen, which can promote rapid growth and actually trigger earlier bolting. In containers, use quality potting mix and feed biweekly with half-strength fertilizer. Keep soil consistently moist but never waterlogged.

Ideal Temperature

Hardiness Zone Compatibility

Begin harvesting slow-bolt cilantro when plants have at least six true leaves, typically 3-4 weeks after germination. Cut outer leaves at the base, leaving the growing center intact for continued production. Harvest in the morning for best flavor. The slow-bolt trait gives you 2-3 additional weeks of leaf harvest compared to standard cilantro. Once flower stalks begin to emerge, harvest the entire plant as the leaves become more pungent and finely cut. Let some plants go to seed for coriander harvest.

Storage & Preservation

Fresh cilantro wilts quickly, so store with stems in a glass of water covered loosely with a plastic bag in the refrigerator for up to 2 weeks. Change the water every few days. For longer storage, freeze chopped cilantro in ice cube trays with water or olive oil. Cilantro does not dry well, as it loses most of its characteristic flavor. Blend fresh leaves into cilantro paste with oil, garlic, and lime juice, then freeze in small portions. Coriander seeds from bolted plants dry well and store for years.

Troubleshooting Common Problems

Even slow-bolt varieties will eventually bolt in sustained heat above 80°F. Maximize harvest by planting in partial shade, mulching heavily, and keeping soil consistently moist and cool. Cilantro has a taproot and cannot be transplanted successfully once established. Poor germination often results from old seed; cilantro seed viability drops significantly after one year. The transition from flat lower leaves to feathery upper leaves signals imminent bolting. Some people perceive cilantro as tasting like soap due to a genetic trait.

Growing Tips

1. Always choose slow-bolt varieties like Santo, Calypso, Leisure, or Slow Bolt for home gardens. Standard cilantro bolts within 3-4 weeks of reaching harvestable size in warm weather, while slow-bolt types give you an extra 2-3 weeks of productive leaf harvest.
2. Sow cilantro seeds directly where they will grow rather than starting indoors and transplanting. Cilantro develops a long, delicate taproot that resents disturbance, and transplanted seedlings often bolt prematurely from the root stress. If you must start indoors, use deep biodegradable pots.
3. Crush or soak the round seed husks before planting. Each cilantro 'seed' is actually a fruit containing two seeds inside a hard shell. Gently crushing the husk with the flat of a knife or soaking in water for 12-24 hours softens the coating and improves germination speed and uniformity.
4. Succession sow every 2-3 weeks without exception. Cilantro has the shortest productive window of nearly any kitchen herb, and no amount of care will prevent eventual bolting. Having fresh sowings at different stages ensures an uninterrupted supply throughout the growing season.
5. Harvest by cutting entire outer stems at the base rather than picking individual leaves. This cut-and-come-again approach encourages the plant to produce new growth from the center and extends the overall harvest period. Never remove more than one-third of the plant at once.
6. Provide consistent moisture but ensure perfect drainage. Cilantro's taproot is susceptible to rot in waterlogged conditions, yet the plant wilts quickly in dry soil. Drip irrigation or soaker hoses deliver the ideal balance of steady moisture without wet foliage.
7. Use shade cloth or interplant with taller crops to provide afternoon shade during warm months. Even slow-bolt varieties will flower rapidly if exposed to sustained temperatures above 30°C (86°F). Shade can reduce soil and air temperatures by several degrees and extend your harvest by weeks.
8. Let a few plants bolt intentionally to attract beneficial insects and produce coriander seeds. Cilantro flowers are among the best insectary plants in the garden, drawing hoverflies, lacewings, parasitic wasps, and other predators that help control aphids and caterpillars on neighboring crops.
9. Grow cilantro in deep containers (at least 25 cm) if garden space is limited. The taproot needs room to develop, and shallow pots cause stunted growth and premature bolting. Use a well-draining potting mix and place containers where they receive morning sun but afternoon shade.
10. Save coriander seeds from your best-performing slow-bolt plants to gradually develop a strain adapted to your local conditions. Select seeds only from the last plants to bolt — over several generations, this simple selection process produces cilantro that is increasingly resistant to bolting in your specific climate.