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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.

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Wikipedia about weed

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.

Weeds may be unwanted because they are unsightly, or they limit the growth of other plants by blocking light or using up nutrients from the soil. They also can harbor and spread plant pathogens that can infect and degrade the quality of crop or horticultural plants. Weeds may be a nuisance because they have thorns or prickles, cause skin irritation when contacted, or parts of the plants might come off and attach to fur or clothes.

Definition

The term weed in its general sense is a subjective one, without any classification value, since a "weed" is not a weed when growing where it belongs or is wanted. Indeed, a number of "weeds" have been used in gardens or other cultivated-plant settings. An example is the corncockle, Agrostemma, which was a common field weed exported from Europe along with wheat, but now sometimes grown as a garden plant.

Distribution

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The weedy nature of these species often gives them an advantage over more desirable crop species because they often grow quickly and reproduce quickly, have seeds that persist in the soil seed bank for many years, or have short lifespans with multiple generations in the same growing season. Perennial weeds often have underground stems that spread out under the soil surface or, like ground ivy (Glechoma hederacea), have creeping stems that root and spread out over the ground. A number of weedy species have developed allelopathy, chemical means to prevent the germination or growth of neighboring plants.

Relation to humans

As long as humans have cultivated plants, weeds have been a problem. Weeds have even been mentioned in religious and literature texts like the following quotes from Genesis and a Shakespearean sonnet:

"Cursed is the ground because of you; through painful toil you will eat of it all the days of your life. It will produce thorns and thistles for you, and you will eat the plants of the field. By the sweat of your brow you will eat your food until you return to the ground,"

"To thy fair flower add the rank smell of weeds: But why thy odour matcheth not thy show, The soil is this, that thou dost common grow."

Weed seeds are often collected and transported with crops after the harvesting of grains, and so many weed species have moved out of their natural geographic locations and have spread around the world with humans. (See Invasive species.) Not all weeds have the same ability to damage crops and horticultural plants. Some have been classified as noxious weeds because if left unchecked, they often dominate the environment where crop plants are to be grown.

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Search results for Weed

Weed, CA City Guide on Yahoo! Local

Yahoo! Local has a business reviews, services, and events near Weed, CA. Use interactive maps, driving directions, reviews and ratings to find the right service near youlocal.yahoo.com/CA/Weed

Weed, California - Wikipedia, the free encyclopedia

The largest employers in Weed are: College of the Siskiyous (100-249 employees) ... Entrance to Weed, California with Mt. Shasta in the background ...en.wikipedia.org/wiki/Weed,_California

weed: Definition from Answers.com

weed n. A plant considered undesirable, unattractive, or troublesome, especially one growing where it is not wanted, as in a garden ... Columbia Encyclopedia: weed, ...www.answers.com/topic/weed

Principles of Sustainable Weed Management for Croplands

Managing croplands in tune with nature's design makes for fewer and less-costly weed problems. This publication discusses proactive weed control strategies ...www.attra.org/attra-pub/weed.html

WEED.COM - Marijuana Pictures, Grow Lights, Medical Pot Laws

Welcome to Weed.com! The #1 Weed, Cannabis, & Marijuana site! ... Ganja Farmer Song & Exotic Juicy Weed Pics/Video From Around The World ...weed.com/

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News about Weed

Argentina's Fernandez Needs More `Weed' Soybeans as Debt Rises

BloombergOct. 1 (Bloomberg) -- Argentina President Cristina Fernandez de Kirchner in March derided the soybean plant as ``a weed,'' suggesting its spread was boosting food prices by displacing wheat, beef and milk production.http://www.bloomberg.com/apps/news?pid=20601086&sid=amLhcFUp...

Horny Goat Weed may offer Viagra alternative: study

Reuters via Yahoo! News A Chinese herbal remedy called horny goat weed is a promising alternative to Viagra for impotent men, Italian researchers said on Monday.http://news.yahoo.com/s/nm/20080930/od_nm/us_hornygoatweed_2

Beetles grow weed killer

Science NewsFemale beetles protect food for their offspring with a bacterial compound new to sciencehttp://www.sciencenews.org/view/generic/id/37160/title/Beetl...

City warned about using weed killer

Cumberland Times-NewsPersistence by a Broadway Street resident, who was told by city officials that a weed killer being used in his neighborhood was perfectly legal, has resulted in a state agency issuing the city a violation.http://www.times-news.com/local/local_story_275085357.html

Pair accused of teaching young children to smoke weed

The Capital TimesThe father and stepmother of two children, ages 9 and 3, were charged Thursday with providing the kids with marijuana and teaching them how to smoke it. The accused also blew smoke into the face of their 1-year-old boy, the criminal complaint says, especially when he was teething, and let their son lick a marijuana pipe. Mathew J. Mathias, 27, and Ashely C. Mathias, 21, were both released on ...http://madison.com/tct/news//index.php?ntid=307611

News about Weed

Don Janssen: Add peonies to the garden this month

Lincoln Journal StarAfter that, proper care — including regular watering, fertilizing and weed control — should keep peonies producing large, high-quality blossoms for 10 to 15 years. Blossoms get smaller as crowding increases. Don Janssen is an Extension educator ... http://www.journalstar.com/articles/2008/10/13/living/home_a...

Cops and Courts

Morning JournalThe occupants of the apartment told police, Veliz said he would not leave unless they did an ecstasy pill, cocaine or smoke “weed” with him to prove they weren’t the police, the police report said. One of the occupants of the apartment used a ... http://www.morningjournal.com/articles/2008/10/13/news/doc48...

Rocky Barker: INL poised for energy economy

Idaho StatesmanThe extension of the Secure Rural Schools and Community Self-Determination Act brings back from the dead Resource Advisory Councils, which direct a portion of the spending to projects like weed control, habitat improvement and fire prevention. These ... http://www.idahostatesman.com/localnews/story/533958.html

Natural Viagra? 'Horny goat weed' shows promise in lab studies

Science CentricMove over, Viagra! Researchers in Italy report that an ancient Chinese herbal remedy known as 'horny goat weed' shows potential in lab studies as source for new future drugs to treat erectile dysfunction (ED). The study, which provides scientific ... http://www.sciencecentric.com/news/article.php?q=08100674

Man shows up during search: That weed's mine

NW Florida Daily NewsCRESTVIEW -- A man who showed up at his girlfriend's home to find it being searched by Crestview Police Department officers claimed the bag of marijuana in the bedroom as his own. "That weed's mine," he told police. When they told him he was being ... http://www.nwfdailynews.com/news/marijuana_11690___article.h...

Search results for Weed

Zum Weed

Welcome to WEED.ORG.  This is a simple test site and will be updated in the future (no promises on when though ;-). See Calendar and Projects for a possible list of events.http://www.weed.org/

Welcome — Weed Chamber of Commerce

The City of Weed is nestled at the foot of beautiful Mount Shasta, the second highest volcano in the United States and a major peak of the Cascade range. Weed is a growing and ... http://www.weedchamber.com/

Weed Instrument Co., Inc. - Manufacturer of temperature sensors, RTDs ...

Manufacturer of temperature sensors, RTDs, transducers,temperature transmitters, fiber optic modems, pressure transmitters, pressure switches, tank gauging sensors, and fiber optic ... http://www.weedinstrument.com/

Urban Dictionary: weed

An ancient plant, refrenced biblically {the Holy Herb}. Gets you rocked, and has been proven to be less harmful then alcohol or cigarettes. It has never been conclusively proven to ... http://www.urbandictionary.com/define.php?term=weed

WeedAlert.com

The Turf Professional's Online Source for Weed Control Options. ... Click on your region for local weed alerts. brought to you byhttp://www.weedalert.com/
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Videos found for Weed

Where's the Weed At?

Where's the Weed At?Where's the Weed At? off of Kottonmouth Kings 8th album Koast II Koast ... Dropping 6.6.06 Check www.Kottonmouthkings.com for more information.Flash - Video

My Name is Earl - Crabman's Weed Ga...

My Name is Earl - Crabman's Weed GardenThe Crabman is quite the gardener.Thursdays on NBC.Flash - Video

Modern Marvels: Weed Whacker

Modern Marvels: Weed WhackerModern Marvels takes a look at the aptly titled weed whacker.Windows Media - Video

Weed class?

Weed class?You know you're in a different kind of college when five pot plants are in the classroom. KTVU's Mike Mibach reports.Windows Media - Video

1971 Weed Smoking and Marijuana Pro...

1971 Weed Smoking and Marijuana Propaganda FilmThe dangers of marijuana on film! This is a discussion-stimulating video from the 1970's, made by the UCLA Social Seminar Series, which explores the reasons for and implications...MPEG 4 - Video

Videos found for Weed

SNL - Weed.mpeg

SNL - Weed.mpeg Hai mai fumato uno spinello? di Andrea Benpensante - MPEG - 6.75 Mb - Italiano - www.iene.it Weed Saturday Night Live - MPEG - 27.6 Mb - English - SNL web site Cannabis-WEB-TV sites:mpeg: 26.6 MB w:352px - h:240px

Lord_Of_The_Weed_-_Sinnlos_in_Mitte...

Lord_Of_The_Weed_-_Sinnlos_in_Mittelerde_MVCD.mpgLord of the Weed I Was machen die Toileten-Figuren eigentlich so?mpeg: 129.4 MB w:352px - h:288px

The-Lord-if-the-Weed---Sinnlos-in-M...

The-Lord-if-the-Weed---Sinnlos-in-Mittelerde.AVIMadness_Combat3.swf 14-Oct-2004 16:42 2.4M THCwantsYOU.gif 20-Oct-2004 16:51 82K The-Lord-if-the-Weed.. 13-Apr-2004 15:27 76M ass.swf 21-Dec-2004 12:45 19Kavi: 76.4 MB w:352px - h:256px

weed killer.wmv

weed killer.wmvtatidea6.JPG 14-Mar-2005 06:08 412k topnobz.jpg 16-Jul-2005 06:00 75k weed killer.wmv 31-May-2005 10:17 4.8Mmsmedia: 4.8 MB w:320px - h:240px

Roundup Weed and Grass Killer User ...

Roundup Weed and Grass Killer User Review 6064This works great for killing all those darned weeds Videopinions are product reviews and demonstrations by the people who use them - in full motion video. Go to Expo TV at www.expotv.com to find more...flash: 0 MB w:400px - h:300px

Answers for Weed

MamaBear

What kind of weed control should I use on my newly-seeded lawn?

MamaBearwait at least four mowings to do anything. Also a good idea is to wait a good month to six weeks. Personally i would get down and pick the weeds by hand. Might think i am crazy but i live on a few acr...
your_pet_sitter

What is the best weed killer that won't kill my other flowers?

your_pet_sitterYup. Wishfull thinking. The best thing to use is on the end of your arm. Get the weeds up, ALL OF THEM, and spread Preen. Mulch heavily, and spread Preen again. No more weeds. I did this at my ...
jarrettman882002

When do I use weed and feed on my lawn?

jarrettman882002go to Scotts.com they have friendly e-mails they send you when it's time to do things to your lawn. just sign-up it's free. you don't have to use their products to get the info. you just put your zo...
I'm Gonna Tell You

What is the best weed poison to use on tall grass in your garden?

I'm Gonna Tell YouRoundup will kill anything it touches roots & all. You can buy it premixed if you don't have a large area. If you have a lot to do get some of the concentrate & mix it in a garden sprayer.
Mildred

When is it safe to use weed killer on a new fescue lawn?

MildredAfter your first mowing it is safe

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