How to Grow Paris Island Cos
Lactuca sativa 'Paris Island Cos'
Paris Island Cos is a beloved heirloom lettuce celebrated for its crisp, buttery leaves and classic romaine shape. Gardeners prize this cool-season crop for its reliable yield and ability to tolerate light frost while thriving in full sun or partial shade.
📷 Wikipedia: LettuceStarting Paris Island Cos: indoors or direct sow?
🌾 Sow directly in the garden — Paris Island Cos is not usually started indoors.
This variety is best direct-sown into the garden or started indoors and transplanted carefully once seedlings have developed their first set of true leaves, ensuring they are moved outdoors within that two-to-six-week window before the last frost.
Soil, care & harvest
Prepare loose, well-draining soil with a pH between 6.0 and 7.0 before sowing seeds directly outdoors two to six weeks before your last spring frost date. You can also start indoors during this window for an early head start. Press seeds gently into the soil surface without covering them deeply, as they need light to germinate successfully within seven to ten days.
Space plants eight to ten inches apart to allow proper airflow and leaf expansion. While lettuce does not require support or trellising, keep the soil consistently moist with about one to one-and-a-half inches of water weekly. Apply a light layer of mulch around the base to retain moisture, but avoid heavy feeding since lettuce grows quickly without excessive nutrients.
Watch for aphids, cabbage worms, slugs, and thrips; use row covers or hand-picking to manage these pests early. Prevent tipburn and downy mildew by ensuring good air circulation and watering at the base rather than overhead. Harvest outer leaves when they are tender, typically sixty-six to seventy-five days after sowing for a continuous supply of fresh greens.
When to Plant Paris Island Cos
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 1 | — | June – July | August – September |
| Zone 2 | — | May – July | July – September |
| Zone 3 | — | May – June | July – October |
| Zone 4 | — | April – June | July – October |
| Zone 5 | — | April – May | June – November |
| Zone 6 | — | April – May | June – November |
| Zone 7 | — | March – May | May – November |
| Zone 8 | — | March – April | May – December |
| Zone 9 | — | February – March | April – December |
| Zone 10 | — | January – March | March – December |
| Zone 11 | — | January – February | February – December |
| Zone 12 | — | January – February | February – December |
| Zone 13 | — | January – February | February – December |
Companion Plants for Paris Island Cos
✓ Good companions
Grows well in similar soil conditions and helps break up soil for lettuce roots
Repels aphids and improves lettuce flavor while providing natural pest deterrent
Attracts beneficial insects like ladybugs and lacewings that control lettuce pests
Repels aphids, slugs, and other pests that commonly attack lettuce
Repels nematodes, aphids, and other harmful insects that damage lettuce
Acts as trap crop for aphids and cucumber beetles, protecting lettuce
Quick-growing companion that helps break up soil and can be harvested before lettuce needs full spac…
Similar growing requirements and can be interplanted for efficient space usage
✗ Keep away from
Competes heavily for nitrogen and can shade out lettuce with its large leaves
Produces allelopathic compounds that inhibit lettuce germination and growth
Releases juglone, a natural herbicide toxic to lettuce and most vegetables
Nutrition Facts
Per 100g serving (USDA FoodData Central)
