Nectar is sweet viscous secretion from the nectarines or glands, in plant blossoms, stems and leves which is sugar solution composed of one disaccharide and two hexoses. Rose flower does not have any nectar and sunflower , goldenrod, cosmos, mint , etc are good examples of nectar.
Both water as well as wind for pollination are not very colorful and do not produce nectar because there is no need to attract the pollinating agents.These plants produce enormous numbers of small pollen grains , wind pollinated plants may be allergens, but seldom are animal pollinated plants allergenic.
Moths are the nocturnal pollination because they pollinate flower that only bloom at night.Bees or butterflies pollinate plants whose scent is high during the day, moths and bats pollinate plants whose fragnace is greatest at night.
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