Providing it stayed alive long enough for you to measure it.
Saltwater plants can. Freshwater plants usually can't. Most land plants can't either.
Saltwater kills most plants.
Cactus.
yes
Elodea is a freshwater aquatic plant.
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red grape algea
Seaweed, algae
The law of diminishing returns implies that adding one factor of production does not always mean an increase in output. In agriculture, adding fertilizer may increase output, but if too much fertilizer is used, it may end up poisoning the plants.
answer.com lies a lot
The Zionists during and prior to the creation of the State of Israel, brought much more advanced agronomic techniques to the Middle East than that region had ever seen before. There were modern systems of water-piping and irrigation, the use of hardier crops and genetic variants, the use of secondary crops (such as peanuts) to replenish the soil with nutrients, the increase of the size of farms and the use of mechanized forms of reaping, the use of insecticides, the use of stabilizing plants (such as eucalyptus trees) to firm up swampy soil enough for cultivation, the use of genetic engineering to pioneer saltwater crops (such as the saltwater tomato), and the increased prevalence of desalination plants and humidity-liquifiers to increase liquid water content.
Most plants would die in salt water.