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In North American English it is known as "romaine" lettuce, and in British English the names "cos" lettuce and "romaine" lettuce are both used. [2] Many dictionaries trace the word cos to the name of the Greek island of Cos, from which the lettuce was presumably introduced. [3] Other authorities trace cos to the Arabic word for lettuce, khus ...
It is a hardy plant that grows to zone 5, and in mild climates it is grown as a winter green. In warm conditions it tends to bolt to seed, [3] producing much-branched stems with clusters of flowers. The flowers have a bluish-white corolla of five fused petals, 1.5 to 2 mm (1 ⁄ 16 to 5 ⁄ 64 in) long and wide, and three stamens.
Lactuca virosa. Lactuca virosa is a plant in the Lactuca (lettuce) genus, often ingested for its mild analgesic and sedative effects. [2] It is related to common lettuce (), and is often called wild lettuce, bitter lettuce, laitue vireuse, opium lettuce, poisonous lettuce, tall lettuce, great lettuce [3] or rakutu-karyumu-so.
The outbreak of E. coli killed five people and sickened at least 210 in 36 states, making it the largest outbreak of the infection in a decade.
Raw iceberg lettuce is 96% water, 3% carbohydrates, and contains negligible protein and fat (table). In a reference amount of 100 grams (3.5 oz), iceberg lettuce supplies 14 calories and is a rich source (20% or more of the Daily Value, DV) of vitamin K (20% DV), with no other micronutrients in significant content (table).
With top-fed deep water culture, the roots get easy access to water from the beginning and will grow to the reservoir below much more quickly than with a deep water culture system. Once the roots have reached the reservoir below, there is not a huge advantage with top-fed deep water culture over standard deep water culture.
Pistia is a genus of aquatic plants in the arum family, Araceae.It is the sole genus in the tribe Pistieae which reflects its systematic isolation within the family. [5] The single species it comprises, Pistia stratiotes, is often called water cabbage, water lettuce, Nile cabbage, or shellflower.
Lettuce, for example, grows best in a pH of 5.6–6.0, EC of 1.1–1.4 dS·m −1, 17 mol·m −2 ·d −1 daily light integral which may consist of a combination of natural and supplemental lighting, air temperature of 24 °C day/19 °C night, water temperature of 25 °C, and dissolved oxygen of >7 mg·L −3.