In particular, weeds are adapted to thrive under human management in the same way as intentionally grown plants. Īlthough whether a plant is a weed depends on context, plants commonly defined as weeds broadly share biological characteristics that allow them to thrive in disturbed environments and to be particularly difficult to destroy or eradicate. Thus, alternative nomenclature for the same plants might be hardy pioneers, cosmopolitan species, volunteers, "spontaneous urban vegetation," etc. Similarly, volunteer plants from a previous crop are regarded as weeds when growing in a subsequent crop. For this reason, some plants are sometimes called beneficial weeds. Some plants that are widely regarded as weeds are intentionally grown in gardens and other cultivated settings. Taxonomically, the term "weed" has no botanical significance, because a plant that is a weed in one context, is not a weed when growing in a situation where it is wanted. Invasive species, plants introduced to an environment where their presence negatively impacts the overall functioning and biodiversity of the ecosystem, may also sometimes be considered weeds. The concept of weeds is particularly significant in agriculture, where the presence of weeds in fields used to grow crops may cause major losses in yields. Plants with characteristics that make them hazardous, aesthetically unappealing, difficult to control in managed environments, or otherwise unwanted in farm land, orchards, gardens, lawns, parks, recreational spaces, residential and industrial areas, may all be considered weeds. Weeds growing in the cracks of a concrete staircaseĪ weed is a plant considered undesirable in a particular situation, growing where it conflicts with human preferences, needs, or goals. For other uses, see Weed (disambiguation). For the psychoactive plant commonly called "weed", see Cannabis (drug). This article is about plants specifically called "weeds".
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