68 days. [1952, named after Parris Island, SC.] Parris Island Cos has steadily gained in popularity since its introduction. It has resistance to tipburn, tolerance to mosaic, and is medium-to-slow-bolting. A 2020 study identified it as one of the best romaines for keeping after leaves are cut. 10-12 in. heads of slightly savoyed leaves with a creamy white heart.
Romaine (Cos) Lettuce
How to Grow: Lettuce is a cool-weather crop that thrives in the temperature range 60-65 degrees F, and if thoroughly hardened, most varieties survive temperatures as low as 20 degrees F. Cold-adapted varieties survive much lower temperatures. Seed germinates best at about 75 degrees F. Lettuce seed will germinate at a temperature as low as 40 degrees F. Early spring plantings should be made as hardened transplants from seed started one month before setting outdoors. Later plantings can be direct-seeded. Sow seed 1/4″ deep and thin to 10-16″ apart depending on the variety. Loose-leaf varieties may be planted more closely but good air circulation should be maintained around the plants. Soil should be cool and moist during the germination period.
Packet: 0.5g unless stated (approximately 400-625 seeds, depending on variety) sows 30’ direct seeded or 175’ as transplants.