Nectar

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Nectar is a thick, sugary juice made by special plant glands called nectaries. It sits in or near many flowers to attract pollinators, like bees, butterflies, moths, hoverflies, ants, mosquitoes, hummingbirds, honeyeaters and even bats. Some nectaries are inside the flower, while others are outside the flower and mainly help defend the plant by feeding helpful insects.

Nectar is especially important in nature and in human life. It provides the sugar that honey bees use to make honey. In farming and gardening, nectar also feeds the adult stages of predatory insects (like certain wasps), which then help control crop pests. For example, some wasps rely on nectar for energy and, in turn, hunt pest insects that damage crops.

Nectar mainly comes from flowering plants, but some ferns and other plants also produce it. The word nectar comes from ancient words meaning a life-giving drink. There are different kinds of nectaries. Floral nectaries appear on various parts of the flower, and some plants have special structures like nectar spurs that help pollinators reach the nectar. Nectaries secrete nectar from epidermal cells, using sugars transported there by the plant’s vascular tissues.

Extrafloral nectaries are nectar glands that appear outside the flower and do not help with pollination. Their job is often to defend the plant by attracting ants and other predators that eat herbivores. Plants like Acacia and passion flowers use extrafloral nectaries to recruit bodyguards, while some carnivorous plants also grow them. Historically, scientists have debated their exact purpose, but they are now seen as a way to defend plants.

Nectar composition is mainly sugars—glucose, fructose, and sucrose—but it also contains amino acids, water, and various chemicals. Some compounds help attract specific pollinators, while others deter predators. For example, some tobacco plants release aromas to attract birds and moths, while adding bitter chemicals like nicotine to discourage overdoing the drink. Some nectars even contain compounds that can protect the plant from pathogens.

Nectaries and nectar have evolved in many plant groups. In many families, nectar helps attract the right pollinators, shaping how flowers look and smell. In some groups, nectaries are common; in others, they’re rare or absent if wind is the main pollination method. Ferns also have leaf nectaries, dating back millions of years, showing that nectar’s role is ancient and widespread.

Other related nectar-secreting structures include elaiophores (oil-secreting) and osmophores (scent-secreting), which help attract pollinators in different ways. Some orchid species use strong scents to draw pollinators, and some flowers release pollinator-specific scents at particular times.

In short, nectar is the plant’s sweet reward system. It lures pollinators to help plants reproduce, fuels beneficial predators that defend crops, and comes in a rich variety of forms and chemicals across the plant kingdom.