Lactuca sativa 'Parris Island Cos'

RHS Plant Profile

lettuce (Cos) 'Parris Island'

Synonyms

Lactuca sativa 'Parris Island'

Annual Biennial

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Named after a small island off South Carolina, this heritage variety is a firm favourite due to its crisp, tasty leaves that are delicious in salads and sandwiches. It also boasts good bolt resistance, especially if given a little afternoon shade, and a reasonable resistance to lettuce mosaic virus. This upright variety can grow up to about 30cm tall and can be grown as ‘cut-and-come-again’ or left until a full heart is produced. Sow March – April, harvest June to October.

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 1 year
Max Spread: 0.1-0.5 metres
Max Height: 0.1-0.5 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: South–facing or East–facing or West–facing or North–facing
Exposure: Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H3

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Asteraceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Clump forming
Genus: Lactuca can be annuals, biennials, perennials or shrubs, with alternate leaves, milky white sap and daisy-like flowers in white, yellow or blue. The genus includes a wide range of wild plants, as well as species cultivated for their edible leaves (lettuce)
Name Status: Accepted

How to Grow

Cultivation

Grow in full sun in moisture-retentive soil. Soil should be reasonably fertile so you can improve soil by adding organic matter, such as well-rotted manure, in the autumn. Lettuces grow best on soil that is close to neutral so if you have very acidic or alkaline soil you may want to consider raised beds, containers or improving the pH of your soil. Water when the soil is dry, ideally early in the morning. Harvest from June until October. See lettuce cultivation for more information.

Propagation

Propagate by seed. See sowing vegetable seeds

Suggested planting locations and garden types

Patio and container plants
Cottage and informal garden

Pruning

No pruning required

Pests

May be susceptible to birds, slugs, snails and lettuce root aphid.

Diseases

May be susceptible to grey moulds and lettuce downy mildew. Shows some resistance to Lettuce mosaic virus.