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After harvest, lettuce lasts the longest when kept at 0 °C (32 °F) and 96 percent humidity. The high water content of lettuce (94.9 percent) creates problems when attempting to preserve the plant – it cannot be successfully frozen, canned or dried and must be eaten fresh. [ 34 ]
Lactuca perennis, common names: mountain lettuce, [2] blue lettuce or perennial lettuce, is a perennial herbaceous plant species belonging to the genus Lactuca of the family Asteraceae. It is widespread across most of central and southern Europe. [ 3 ]
The lettuce also became subject to betting, with bookmakers who had been previously contacted by Daily Star staff placing Truss's chances of survival past the lettuce as low; on 17 October, a £9 bet at Ladbrokes of the lettuce lasting longer would yield a £13 payout. [6] [3]
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Each head is just over a centimeter (0.4 inches) wide and has many whitish to light blue ray florets but no disc florets. The fruit is a mottled achene about half a centimeter (0.2 inches) long with a brownish pappus. Lactuca biennis was described botanically in 1794, with the name Sonchus biennis, then transferred to Lactuca in 1940. [1]
Lactuca sibirica, the Siberian lettuce, is a species of wild lettuce native to Norway, Sweden, Finland, the Baltic states, Belarus, Ukraine, all parts of Russia, Kazakhstan, Mongolia, the northern half of China, the Korean peninsula, Sakhalin, the Kuril Islands, and Japan. [2]