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[Lactuca sativa var. longifolia] Red romaine lettuce seeds, elongated head, bronze-tinted leaves that deepen with sun exposure.
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A reddish variant of the classic romaine lettuce, red romaine combines the typical elongated shape with a sturdy central rib and a bronze colouring on the outer leaves that deepens with sun exposure.
It belongs to the species Lactuca sativa var. longifolia, family Asteraceae. It forms a semi-closed elongated head with fleshy-ribbed leaves whose margins shift from green to reddish-bronze depending on sun exposure.
Sow from February to September in a seedbed or directly in the field during warmer months, transplanting about 30 days after germination.
It prefers cool, well-drained soils rich in organic matter; it dislikes waterlogging and excessive heat, which can cause premature bolting and flowering.
Harvest about 70-80 days after sowing, once the head has reached adequate size; regular, moderate watering keeps the leaves crisp.
Like other lettuces, it can be affected by downy mildew and grey mould in humid conditions; aphids and slugs are the most common pests to monitor.
Excellent raw in salads for the colour contrast with green leaves, its reddish tint is due to anthocyanin accumulation, pigments that intensify with lower temperatures.
Rich in vitamin A and beta-carotene typical of dark lettuces, the red variant also provides antioxidant anthocyanins absent in green cultivars.
Per 100 grams, red romaine lettuce provides about 17 kcal, 1.4 g protein, 2.4 g carbohydrates, 0.2 g fat and 1.8 g fibre. Good source of vitamin A and folate.