Product Overview
Romaine lettuce is a widely traded leafy vegetable valued for its crisp texture, elongated shape, and balanced flavor. It is a key commodity in fresh produce markets, commonly used in both retail and food service sectors. Romaine is especially popular for salads, including classic preparations such as Caesar salad.
Key Characteristics
Romaine lettuce forms elongated, upright heads with sturdy ribs and crisp, dark green outer leaves. The inner leaves are lighter in color and more tender. Texture is crunchy and firm, with a slightly sweet and mildly bitter flavor. Romaine lettuce is non-climacteric and does not continue to develop after harvest.
Nutritional Value
Romaine lettuce is low in calories and provides dietary fiber. It contains vitamins A, C, and K, along with folate and small amounts of potassium. Its darker leaves contribute to higher nutrient content compared to lighter lettuce varieties.
Seasonality and Origin
Romaine lettuce is grown in temperate regions and is available year-round due to continuous cultivation. Major production regions include the United States (California and Arizona), Europe, and parts of Asia. Its adaptability supports consistent supply in global markets.
Common Applications
• Fresh salads (especially Caesar salad)
• Sandwiches and wraps
• Garnishing
• Grilling and specialty dishes
• Cold preparations
• Foodservice use
Storage and Handling
Proper handling is essential to maintain crispness and freshness.
• Recommended storage temperature: 32°F to 36°F
• Relative humidity: 95–100%
• Shelf life: 1–2 weeks under optimal conditions
• Store in moisture-retentive packaging
• Keep refrigerated at all times
• Avoid exposure to ethylene-producing commodities
• Handle carefully to prevent leaf damage
Origin and Background
Romaine lettuce is believed to have originated in the Mediterranean region and has been cultivated since ancient times. It has remained a staple in global cuisine due to its texture and versatility. Modern production focuses on improving head uniformity, shelf life, and resistance to environmental stress.
Grades and Quality Standards
| U.S. Grade Standards | Days Since Shipment | % of Defects Allowed | Optimum Transit Temp. (°F) |
| 10-5-2 | 5 4 3 2 1 | 15-8-4 14-8-4 13-7-3 12-6-2 10-5-2 | 32° |
Extra Fancy Grade
• Uniform, well-formed heads with crisp leaves
• Fresh appearance with deep green color
• Free from wilting, discoloration, and defects
Fancy Grade
• Slight variations in size and appearance
• Minor imperfections allowed
• Suitable for retail distribution
Commercial / Processing Grade
• Visible defects permitted
• May include looser heads or damaged leaves
• Used for processing and bulk applications