A crop is "a plant or animal product that can be grown and harvested extensively for profit or subsistence." Crop may refer either to the harvested parts or to the harvest in a more refined state (husked, shelled, etc.). Most crops are cultivated in agriculture or aquaculture. A crop is usually expanded to include macroscopic fungus (e.g. mushrooms), or alga (algaculture).
Most crops are harvested as food for humans or (fodder crops). Some crops are gathered from the wild (including intensive gathering, e.g. ginseng).
Important non-food crops include horticulture, floriculture and industrial crops. Horticulture crops include plants used for other crops (e.g. fruit trees). Floriculture crops include bedding plants, houseplants, flowering garden and pot plants, cut cultivated greens, and cut flowers. Industrial crops are produced for clothing (fiber crops), biofuel (energy crops, algae fuel), or medicine (medicinal plants).
Animals and microbes (fungi, bacteria or viruses) are rarely referred to as crops. Animals raised for human or animal consumption are referred to as and microbes as microbiological cultures. Microbes are not typically grown for food itself, but are rather used to alter food (e.g., producing citric acid, fermenting yogurt, soy sauce, or sauerkraut).