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A weed in a general sense is a plant that is considered by the user of the term to be a nuisance, and normally applied to unwanted plants in human-made settings such as gardens, lawns or agricultural areas, but also in parks, woods and other natural areas. More specifically, the term is often used to describe native or nonnative plants that grow and reproduce aggressively.

The following gallery shows the best known weeds of the Northern Hemisphere.

Български: Плевел
Čeština: Plevel
Dansk: Ukrudt
Deutsch: Unkraut
English: Weeds
Español: Maleza
Français : Adventice
Italiano: Piante infestanti
עברית: עשב
Nederlands: Onkruid
日本語: 雑草
Norsk bokmål: Ugress
Polski: Chwast
Русский: Сорное растение
Српски / srpski: Коров
Suomi: Rikkakasvi
Українська: Бур'ян

Weeds of the Northern Hemisphere.
Aegopodium podagraria
Anagallis arvensis
Artemisia vulgaris
Atriplex patula
Bellis perennis
Calystegia sepium
Campanula rapunculoides
Capsella bursa-pastoris
Cerastium fontanum
Chenopodium album
Cirsium arvense
Conyza canadensis
Elytrigia repens
Epilobium montanum
Equisetum arvense
Fallopia convolvulus
Fumaria officinalis
Galium aparine
Myosotis arvensis
Persicaria maculosa
Plantago major
Poa annua
Polygonum aviculare
Senecio vulgaris
Solanum nigrum
Sonchus oleraceus
Spergula arvensis
Stellaria media
Taraxacum officinale
Tripleurospermum perforatum
Urtica dioica
Urtica urens
Veronica arvensis
Veronica persica
Viola arvensis