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Why cilantro bolts—and what you can control
Cilantro is a cool-season crop. Hot weather can hasten flowering, after which the plant shifts from leafy growth to flowers and seeds. There is no single temperature threshold that guarantees when bolting will happen, so treat these methods as ways to extend the harvest, not prevent flowering indefinitely.
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These tactics work on different parts of the problem: planting time and shade reduce heat exposure, successive sowing keeps younger plants coming, and cultivar choice may extend an individual plant’s leafy stage.
1. Sow when the weather is cooler
For leaves, sow in early spring and again in early autumn if your local climate allows. Avoid peak summer heat when possible. Oregon State University Extension notes that sowing in late June or early July can lead to flowering during long, hot summer days. Adjust dates to your local frost timing and growing conditions rather than following a fixed calendar.
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Direct-sow the seed where the plants will grow. Cilantro has a taproot, which makes transplanting difficult. See Oregon State University Extension’s planting guidance.
2. Give plants relief from afternoon heat
Choose the coolest suitable spot in the garden. When warm weather arrives, afternoon shade—or shade cast by taller neighboring plants—can reduce heat exposure. Oregon State and Maryland Extension recommend a cool or partly shaded location for leafy cilantro, with Maryland specifically advising afternoon shade. Shade can delay bolting, but it cannot guarantee that a plant will stay leafy.
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3. Sow small batches in succession
Instead of relying on one planting, sow a small new batch every two to four weeks. The timing varies among extension recommendations: Illinois Extension suggests every three to four weeks, while Wisconsin and Maryland Extension suggest every two to three weeks. Use the interval that fits your climate and how often you want to sow; the goal is to have younger plants ready as older ones flower.
Oregon State University Extension likewise recommends sowing small batches every few weeks to maintain a supply of leafy cilantro.
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4. Pick a slow-bolting variety
Extension sources list ‘Leisure’, ‘Santo’, ‘Calypso’, and ‘Slow Bolt’ as slow-bolting choices. Illinois Extension also describes ‘Leisure’ as heat tolerant. These traits are relative: a variety may extend the leaf harvest, but it will eventually flower, particularly in hot conditions. Seed availability varies by seller and season.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Harvest leaves before flowering takes over
Harvest while plants are still leafy. Penn State Extension says leaf harvest can begin when cilantro plants reach about six inches tall. If flower stems appear, Maryland Extension advises pinching them off to extend the leaf harvest; this is a limited intervention, not a way to keep the plant from bolting permanently. You can also leave some plants to flower for pollinators and later harvest their coriander seeds.
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Choose a plan that fits your garden
- For a hot-season garden: use afternoon shade and sow small batches more frequently within the recommended two-to-four-week range.
- For a short leaf-harvest window: combine a cooler-season sowing with a slow-bolting variety.
- If you want coriander seed: let some plants flower and set seed rather than pinching every flower stem.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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