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In general use, herbs are plants with savory or aromatic properties that are used for flavoring and garnishing food, for medicinal purposes, or for fragrances; excluding vegetables and other plants consumed for macronutrients. Culinary use typically distinguishes herbs from spices. Herbs generally refers to the leafy green or flowering parts of a plant (either fresh or dried), while spices are usually dried and produced from other parts of the plant, including seeds, bark, roots and fruits. Herbs have a variety of uses including culinary, medicinal, and in some cases, spiritual. General usage of the term "herb" differs between culinary herbs and medicinal herbs; in medicinal or spiritual use, any parts of the plant might be considered as "herbs", including leaves, roots, flowers, seeds, root bark, inner bark (and cambium), resin and pericarp. The word "herb" is pronounced / h ɜːr b / in Commonwealth English, but / ɜːr b / is common among North America

In botany, the term herb refers to a herbaceous plant, defined as a small, seed-bearing plant without a woody stem in which all aerial parts (i.e. above ground) die back to the ground at the end of each growing season. Usually the term refers to perennials, although herbaceous plants can also be annuals (where the plant dies at the end of the growing season and grows back from seed next year), or biennials. This term is in contrast to shrubs and trees which possess a woody stem. Shrubs and trees are also defined in terms of size, where shrubs are less than ten meters tall, and trees may grow over ten meters. The word herbaceous is derived from Latin herbāceus meaning "grassy", from herba "grass, herb". Another sense of the term herb can refer to a much larger range of plants, with culinary, therapeutic or other uses. For example, some of the most commonly described herbs such as sage, rosemary and lavender would be excluded from the botanical definition of a herb

Culinary herbs are distinguished from vegetables in that, like spices, they are used in small amounts and provide flavor rather than substance to food. Herbs can be perennials such as thyme, sage or lavender, biennials such as parsley, or annuals like basil. Perennial herbs can be shrubs such as rosemary ( Rosmarinus officinalis ), or trees such as bay laurel ( Laurus nobilis ) – this contrasts with botanical herbs, which by definition cannot be woody plants. Some plants are used as both herbs and spices, such as dill weed and dill seed or coriander leaves and seeds. There are also some herbs, such as those in the mint family, that are used for both culinary and medicinal purposes. Emperor Charlemagne (742–814) compiled a list of 74 different herbs that were to be planted in his gardens. The connection between herbs and health is important already in the European Middle Ages-- The Forme of Cury (that is, "cookery") promotes extensive use of herbs, including in salads, and cl

Some herbs can be infused in boiling water to make herbal teas (also termed tisanes). Typically the dried leaves, flowers or seeds are used, or fresh herbs are used. Herbal teas tend to be made from aromatic herbs, may not contain tannins or caffeine, and are not typically mixed with milk. Common examples include chamomile tea, or mint tea. Herbal teas are often used as a source of relaxation or can be associated with rituals.

Herbs were used in prehistoric medicine. As far back as 5000 BCE, evidence that Sumerians used herbs in medicine was inscribed on cuneiform. In 162 CE, the physician Galen was known for concocting complicated herbal remedies that contained up to 100 ingredients. Some plants contain phytochemicals that have effects on the body. There may be some effects when consumed in the small levels that typify culinary "spicing", and some herbs are toxic in larger quantities. For instance, some types of herbal extract, such as the extract of St. John's-wort ( Hypericum perforatum ) or of kava ( Piper methysticum ) can be used for medical purposes to relieve depression and stress. However, large amounts of these herbs may lead to toxic overload that may involve complications, some of a serious nature, and should be used with caution. Complications can also arise when being taken with some prescription medicines. Herbs have long been used as the basis of traditional Chinese herbal medi

Herbs are used in many religions. During the monastic era, monks would cultivate herbs alongside vegetables, while others would be set aside in a physic garden for specific purposes. For example, myrrh ( Commiphora myrrha ) and frankincense ( Boswellia species) in Hellenistic religion, the nine herbs charm in Anglo-Saxon paganism, neem ( Azadirachta indica ) leaves, bael ( Aegele marmelos ) leaves, holy basil or tulsi ( Ocimum tenuiflorum ), turmeric or "haldi" ( Curcuma longa ), cannabis in Hinduism, and white sage in Wicca. Rastafari also consider cannabis to be a holy plant. Siberian shamans also used herbs for spiritual purposes. Plants may be used to induce spiritual experiences for rites of passage, such as vision quests in some Native American cultures. The Cherokee Native Americans use both white sage and cedar for spiritual cleansing and smudging.

Originally there was always doubt in ancient societies, especially in the sceptical medium of western traditions, as to the efficacity of herbal medicines. The use of herbal cosmetics dates back to around six centuries ago in the European and Western countries. Mixtures and pastes were often concocted to whiten the face. During the 1940s, herbal cosmetics took a turn with the emerging red lipstick color, with every year gaining a more intense red. Herbal cosmetics come in many forms, such as face creams, scrubs, lipstick, natural fragrances, powders, body oils, deodorants and sunscreens. They activate through the epithelium of sebaceous glands to make the skin more supple. Ayurvedic oils are widely used in India, prized for their natural health-giving properties. One method and perhaps the best, used to extract natural oils from herbs to make lipstick is partition chromatography. The process involves separation in watery solution, and then the injection of colour under pressure.

Strewing herbs are scattered (strewn) over the floors of dwelling places and other buildings. Such plants usually have fragrant or astringent smells, and many also serve as insecticides (e.g. to repel fleas) or disinfectants. For example, meadowsweet ( Filipendula ulmaria ) was sometimes strewn across floors in the middle ages because of its sweet smell.