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4: Development of harvestable vegetative plant parts 41: 10% of the leaf mass typical for the variety reached 42: 20% of the leaf mass typical for the variety reached 43: 30% of the leaf mass typical for the variety reached 44: 40% of the leaf mass typical for the variety reached 45: 50% of the leaf mass typical for the variety reached 46
4: Development of harvestable vegetative plant parts 41: Heads begin to form: the two youngest leaves do not unfold 42: 20% of the expected head size reached 43: 30% of the expected head size reached 44: 40% of the expected head size reached 45: 50% of the expected head size reached 46: 60% of the expected head size reached 47
For example, the larvae of the ghost moth is a common pest of lettuce plants. [44] Mammals, including rabbits and groundhogs, also eat the plants. [45] Lettuce contains several defensive compounds, including sesquiterpene lactones, and other natural phenolics such as flavonol and glycosides, which help to protect it against pests. Certain ...
Lactuca, commonly known as lettuce, is a genus of flowering plants in the family Asteraceae. The genus includes at least 50 species, distributed worldwide, but mainly in temperate Eurasia . Its best-known representative is the garden lettuce ( Lactuca sativa ), with its many varieties.
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 ]
Lactuca canadensis is a species of wild lettuce known by the common names Canada lettuce, Canada wild lettuce, and tall lettuce. [2] Its true native range is not clear, [2] but it is considered to be a native of the eastern and central parts of North America. It naturalized in the western part of the continent as well as in Eurasia. [3] [4]
Lactuca biennis is a North American species of wild lettuce known by the common names tall blue lettuce and blue wood lettuce. It is widespread across much of the United States and Canada from Alaska and Yukon south as far as California , New Mexico , and Georgia .
Romaine or cos lettuce (Lactuca sativa L. var. longifolia) is a variety of lettuce that grows in a tall head of sturdy dark green leaves with firm ribs down their centers. Unlike most lettuces, it is tolerant of heat.