#Lettuce or #LactucaSativa, is an annual leaf vegetable of the #aster family (#Asteraceae). In India, lettuce is also known as the #GooseVegetable, #TropicalLettuce, Ku mak, Yao mak, Ku Mak Cai, Daun Panjang and Sawi Rana. Indian lettuce is a general descriptor used to describe several Asian plants with leaves that vary in shape and size.
Asteraceae, also called #Compositae, is the aster, daisy or composite family of the flowering plant order Asterales. With more than 1,620 genera and 23,600 species of herbs, shrubs and trees distributed worldwide, Asteraceae is one of the most prominent plant families.
Most lettuce varieties are eaten fresh and are commonly served as the base of green salads. Lettuce is generally a rich source of vitamins K and A, though the nutritional quality varies, depending on the variety.
Lettuce plants can have taproots or fibrous root systems. The leaves of domesticated varieties come in a wide range of colours, from shades of green to deep red and purple, variegated varieties have also been developed.
Lettuces are harvested before flowering, as the “bolting” of the flower stalk elongates head lettuce, reduces the size of the leaves, and imparts a bitter flavour. The yellow flower heads produce achene fruits with feathery pappus structures for wind dispersal.
For successful cultivation, lettuce requires ample water, especially in warmer weather. During unseasonable weather, protection is furnished and growth is stimulated with greenhouses, frames, #cloches or #polyethylene covers.
In many parts of the world, the cos, leaf and butterhead types are most popular, though some varieties are difficult to ship and are commonly grown on truck farms or market gardens relatively close to markets. The crisphead varieties, well adapted for long-distance shipment, are popular in the United States.
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