What kind of weeds do you have?

Manitoba Gardener Magazine - - LOCAL DIRT -

Weeds are clas­si­fied into three main groups and the kind you have may de­ter­mine how hard you will have to work to erad­i­cate them.

Gar­den va­ri­ety weed

– The Weed Sci­ence So­ci­ety of Amer­ica de­fines a weed as a plant that causes eco­nomic losses or eco­log­i­cal dam­age, cre­ates health prob­lems for hu­mans or an­i­mals or is un­de­sir­able where it is grow­ing. These weeds in­clude crab­grass ( Dig­i­taria), giant fox­tail ( Se­taria faberii) and com­mon lamb­squar­ters ( Chenopodium al­bum).

Nox­ious weeds

– These are des­ig­nated as in­ju­ri­ous to pub­lic health, agri­cul­ture, recreation, wildlife or prop­erty. They may be quar­an­tined to con­trol their spread, or ac­tion may be taken to de­stroy them. These weeds in­clude pur­ple looses­trife ( Lythrum sali­caria) hy­drilla ( Hy­drilla ver­ti­cil­lata) witch­weed ( Striga spp.).

In­va­sive weeds

– With the abil­ity to es­tab­lish them­selves, per­sist and spread widely, these weeds af­fect nat­u­ral ecosys­tems out­side of the plant’s na­tive range. Once es­tab­lished in a for­eign lo­cale, these in­vaders are dif­fi­cult to con­trol as they of­ten lack nat­u­ral en­e­mies to cur­tail their growth. These weeds in­clude treeof-heaven ( Ai­lan­thus al­tissima), saltcedar/ tamarisk ( Ta­marix ramo­sis­sima) downy brome/cheat­grass ( Bro­mus tec­to­rum).

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