Kalura Cos

Family: Asteraceae Vegetable

Planting Schedule

Provide your location or planting zone to unlock dates and add Kalura Cos to a garden.

Crisp as fresh-cut glass, Kalura Cos forms tall, elegant heads with a tender, sweet snap and a clean, lightly buttery flavor.

The leaves are deep green and beautifully elongated, with a sturdy midrib that holds its shape for satisfying bite and effortless serving. Ideal for gardeners who want a reliable Romaine—excellent for fresh salads and also for grilling, braising, and vibrant sauces where its texture stays pleasantly crisp.

Light: Full SunMaturity: 60 DaysHabit: Rosette

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Kalura Cos Planting Dates by USDA Zone

Estimated US hardiness-zone windows for sow, transplant, and harvest. Enter a US ZIP above for exact local dates, or open a zone below.

Zone	Start Indoors	Sow / Transplant	Harvest
Zone 1a	Protected Environment Only
Zone 1b	May 4th	May 25th	Jul 24th – Aug 1st
Zone 2a	Apr 27th	May 18th	Jul 17th – Aug 29th
Zone 2b	Apr 17th	May 8th	Jul 7th – Aug 25th
Zone 3a	Apr 17th	May 8th	Jul 7th – Sep 1st
Zone 3b	Apr 21st	May 12th	Jul 11th – Sep 21st
Zone 4a	Apr 17th	May 8th	Jul 7th – Sep 24th
Zone 4b	Apr 15th	May 6th	Jul 5th – Sep 27th
Zone 5a	Apr 10th	May 1st	Jun 30th – Sep 30th
Zone 5b	Apr 6th	Apr 27th	Jun 26th – Oct 5th
Zone 6a	Apr 3rd	Apr 24th	Jun 23rd – Oct 10th
Zone 6b	Mar 28th	Apr 18th	Jun 17th – Oct 16th
Zone 7a	Mar 23rd	Apr 13th	Jun 12th – Oct 20th
Zone 7b	Mar 13th	Apr 3rd	Jun 2nd – Oct 28th
Zone 8a	Mar 4th	Mar 25th	May 24th – Nov 5th
Zone 8b	Feb 23rd	Mar 16th	May 15th – Nov 12th
Zone 9a	Feb 6th	Feb 27th	Apr 28th – Nov 26th
Zone 9b	Jan 12th	Feb 2nd	Apr 3rd – Dec 9th
Zone 10a	—	Oct 1st	Nov 30th – Feb 28th
Zone 10b	—	Oct 1st	Nov 30th – Feb 28th
Zone 11a	—	Oct 1st	Nov 30th – Feb 28th
Zone 11b	—	Oct 1st	Nov 30th – Feb 28th
Zone 12a	—	Oct 1st	Nov 30th – Feb 28th
Zone 12b	—	Oct 1st	Nov 30th – Feb 28th
Zone 13a	—	Oct 1st	Nov 30th – Feb 28th
Zone 13b	—	Oct 1st	Nov 30th – Feb 28th

Crop Details

Trait	Value
Days to Maturity	60
Sun Requirements	Full Sun
Growth Habit	Rosette
Support Needed	None
Planting Depth	Surface
Germination Temp (°F)	70
Min Soil Temp (°F)	40
Min Night Temp (°F)	32
Harden Off (days)	6

Culinary Notes

Chef's Note

Kalura Cos gives you that romaine-style crunch—sweet, lightly buttery, and built around a midrib that stays grippable rather than collapsing. If you grill or braise it, it gets char-kissed at the edges without turning mushy, which is the whole trick.

Best Uses

classic wedge salad with a bold, creamy dressing
grilling or hot-searing for smoky edges while keeping the core crunchy
braise into quick potage where the midrib structure holds
tossed into herb-forward green salads for texture that doesn’t wilt fast

Flavor Profile

tender sweet snap clean, lightly buttery finish crisp bite with a sturdy midrib

Kitchen Pairings

bacon lemon parmesan garlic olive oil anchovy

Frequently Asked Questions

What pest or disease most often affects Lactuca sativa (kalura cos), and how do I manage it?

Look for aphids and slugs on young leaves; aphids cluster on tender growth and slugs chew holes, especially in humid weather. Spray an insecticidal soap for aphids and hand-remove slugs at dusk, then reduce hiding spots by keeping the bed weed-free and lightly mulched but not soggy. Also watch for downy mildew/botrytis (gray mold): avoid wetting the leaves, water at the soil line, and space plants to improve airflow.

How often should I water kalura cos during its main growing phase?

During the 40–60 day main leaf-growth period, keep the soil consistently moist but not waterlogged—aim for about 1 inch (2.5 cm) per week total, adjusted for heat and soil type. Water deeply 2–3 times per week rather than frequent light sprinkling, and stop after heads are fully formed to reduce rot risk. If leaves wilt in the afternoon, increase watering frequency slightly while still maintaining good drainage.

How can I tell when Lactuca sativa (kalura cos) is ready to harvest?

Harvest at around 60 days when the plant forms a firm, upright cos head with crisp, well-developed outer leaves and the core feels solid when gently pressed. If it bolts (stems elongate and leaves become bitter), harvest immediately before quality drops. For best flavor, cut early in the morning and cool promptly.