Quick Growing Facts

When & Where to Grow ‘Parris Island Cos’

Like other romaine lettuces, Parris Island Cos loves cool conditions and steady moisture. It’s ideal for spring and fall planting, and in mild climates can be grown over winter under protection.

• Spring: Sow outdoors 2–4 weeks before your average last frost date, once soil is workable and at least 40–45°F (4–7°C).
• Fall: Sow 6–8 weeks before expected hard frost so heads mature in cool weather; fall crops are often sweetest.
• Mild climates: Grow in fall, winter, and early spring; avoid the hottest part of summer or use shade cloth.
• Location: Garden beds, raised beds, and containers (about 20–25 cm deep) in full sun to light shade.

Soil Preparation

Parris Island Cos needs rich, well-prepared soil so plants can grow quickly and form tall, dense heads without stress.

• Loosen the top 8–10 in (20–25 cm) of soil and remove weeds, roots, and stones.
• Incorporate plenty of compost or well-rotted manure to boost fertility and moisture retention.
• Rake the surface into a fine, crumbly seedbed so the small seeds make good contact with the soil.
• If soil is very acidic, a light application of garden lime can improve vigor and flavor.
• Ensure good drainage; if soil is heavy clay, use raised beds or add lots of organic matter.

Direct Sowing Parris Island Cos Outdoors

Direct sowing works well in areas with reliably cool springs and falls. In warmer regions, many gardeners combine direct sowing for baby leaves with transplanted heads.

1. Timing: Sow 2–4 weeks before last frost in spring, and again in late summer for fall harvest.
2. Prepare the bed: Rake the soil surface smooth and fine after loosening and adding compost.
3. Sowing depth: Sow seeds very shallowly, about 1/8–1/4 in (0.3–0.6 cm) deep; lettuce seeds do best when not buried too deeply.
4. Row spacing: Space rows 12–18 in (30–45 cm) apart.
5. Seed spacing: Sow seeds about 1 in (2–3 cm) apart; you’ll thin later to the final spacing.
6. Water: Water gently with a fine spray and keep the top layer consistently moist until seedlings emerge.

Starting Romaine Indoors (Recommended for Heads)

Starting Parris Island Cos indoors gives a head start and helps heads mature before hot weather arrives, especially in areas with short springs or hot summers.

• Sow 4–6 weeks before your last expected frost date.
• Use plug trays or small pots with a fine, well-draining seed-starting mix.
• Sow 2–3 seeds per cell at 1/8–1/4 in (0.3–0.6 cm) deep or pressed into the surface; thin to one strong seedling.
• Keep at 60–70°F (15–21°C) with even moisture and strong light to prevent leggy growth.
• Harden off seedlings for 5–7 days, then transplant outdoors when nights are reliably above freezing.

Thinning, Spacing & Transplanting

Proper spacing is key for Parris Island Cos to form tall, well-shaped heads and to keep foliage dry and healthy.

• Thin direct-sown seedlings when they reach 1–2 in (2.5–5 cm) tall.
• For full heads, thin or transplant to 10–12 in (25–30 cm) between plants in rows 12–18 in (30–45 cm) apart.
• For baby-leaf beds, plants can be grown closer, around 4–6 in (10–15 cm) apart or in dense bands for cutting.
• Transplant on a cool, cloudy day or in the evening; plant at the same depth as in the tray and water in well.
• Use thinnings as tender baby greens in salads.

Succession Sowing for Continuous Harvest

Because romaine takes a bit longer than loose-leaf lettuces, succession sowing keeps you supplied with both baby leaves and full heads over a long season.

• Sow or transplant a new small patch every 2–3 weeks during cool weather.
• In warm regions, focus on early spring and late-summer sowings so heads mature in cooler temperatures.
• Harvest or remove plants that start to bolt and replace them with fresh sowings.

Watering & Feeding

Steady moisture and moderate fertility produce crisp, sweet romaine leaves and firm heads without bitterness or tip burn.

• Watering: Keep soil evenly moist but not waterlogged. Aim for about 1 in (2.5 cm) of water per week, more in hot or windy weather.
• Mulch: A light mulch of compost or straw helps retain moisture, suppress weeds, and keep soil cool.
• Feeding: In rich soil, compost at planting is often enough. In poorer soils or containers, use a balanced organic fertilizer or compost tea once or twice during the season.

Pests & Diseases

Parris Island Cos is known for good disease resistance, but common lettuce pests and issues can still appear, especially in damp or crowded plantings.

• Slugs & snails: Common in cool, wet weather. Use traps, barriers, and hand-picking; avoid thick mulch around the crown.
• Aphids: Check inner leaves and midribs; rinse off with water or use insecticidal soap if colonies build up.
• Leaf miners & chewing insects: Remove damaged leaves; row covers can prevent heavy damage.
• Tip burn: Brown edges on inner leaves can result from inconsistent moisture or rapid growth in heat; keep soil evenly moist and avoid overfertilizing with high nitrogen.
• Fungal diseases (downy mildew, rot): Provide good spacing and airflow, water at soil level, and avoid wetting foliage late in the day.
• Bolting: High heat and drought speed up bolting; use shade cloth and steady watering, and aim for cool-season harvests.

Harvesting ‘Parris Island Cos’ Romaine

Baby Leaves & Cut-and-Come-Again

• Begin harvesting baby leaves about 3–4 weeks after sowing, when they are 2–4 in (5–10 cm) long.
• Use scissors to cut outer leaves or shear plants 1–2 in (2–5 cm) above the soil in dedicated baby-leaf beds.
• Plants can often provide multiple cut-and-come-again harvests when watered and fed well.

Full Romaine Heads

• Harvest full heads when they reach about 10–12 in (25–30 cm) tall and feel firm when gently squeezed, usually 60–70 days from sowing.
• Cut the entire head at the base with a sharp knife, just above the soil line.
• Harvest in the cool of the morning for maximum crispness and storage life.
• If plants begin to elongate and form a central flower stalk, harvest immediately; flavor becomes more bitter as bolting advances.

Storing & Using Parris Island Romaine

• Rinse leaves or heads in cool water and spin or pat dry thoroughly.
• Store whole heads or torn leaves in a breathable or lightly sealed container/bag in the refrigerator.
• Use within about 7–10 days for best quality and crunch.
• Enjoy in Caesar salads, mixed salads, wraps, burgers, and sandwiches; the crisp, juicy ribs and sweet hearts are especially good grilled or charred.

Saving Seed from ‘Parris Island Cos’

Lettuce is mostly self-pollinating, so saving seed from Parris Island Cos is straightforward. It will bolt, flower, and set seed if allowed to mature in warm weather.

• Select healthy, true-to-type plants and allow them to bolt and flower after you’re finished harvesting heads.
• Plants produce tall stalks with small yellow flowers, followed by fluffy seed heads.
• When seed heads turn dry and fluffy, cut stalks and place them in a paper bag or over a tray.
• Rub heads gently to release the small seeds and remove excess chaff.
• Store seeds in a labeled, airtight container in a cool, dry, dark place; lettuce seeds generally remain viable for several years.

Tips for Success

• Give romaine rich soil, steady moisture, and cool to mild temperatures for the best heads.
• Use transplants for spring crops in regions with short springs so heads mature before hot weather.
• Mulch and consistent watering help prevent tip burn and bitterness.
• Grow near the kitchen door or in raised beds so you can harvest tall, crisp romaine heads at peak freshness.

Note: Growing conditions and timing vary by region. Adjust sowing dates, watering, and heat or frost protection to match your local climate and weather patterns.