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It is a well-known example of a plant that is considered a weed in some contexts such as lawns but not a weed in others such as when it is used as a vegetable or herbal medicine.
Certain classes of weeds share adaptations to ruderal environments. That is to say: The nature of the habitat and its disturbances will affect or even determine which types of weed communities become dominant.
The weedy nature of these species often gives them an advantage over more desirable crop species because they often grow quickly and reproduce quickly, they commonly have seeds that persist in the soil seed bank for many years, or they may have short lifespans with multiple generations in the same growing season.
In contrast, perennial weeds often have underground stems that spread under the soil surface or, like ground ivy Glechoma hederaceahave creeping stems that root and spread out over the ground. An example is Klamath weedthat threatened millions of hectares of prime grain and grazing land in North America after it was accidentally introduced, but was reduced to a rare roadside weed within several years after some of its natural enemies were imported during World War II.
The weediness of some species that are introduced into new environments may be caused by their production of allelopathic chemicals which indigenous plants are not yet adapted to, a scenario sometimes called the "novel weapons hypothesis".
These chemicals may limit the growth of established plants or the germination and growth of seeds and seedlings. Competition with cultivated and endemic plants cattle that were killed overnight by a poisonous weed.
Other important reasons are that they interfere with other cosmetic, decorative, or recreational goals, such as in lawnslandscape architectureplaying fieldsand golf courses. Similarly, they can be of concern for environmental reasons whereby introduced species out-compete for resources or space with desired endemic plants.
For all these reasons; horticultureboth functional and cosmetic, and environmental- weeds interfere by: These have been very variously defined, but the weed traits listed by H. Baker are widely cited. They are mentioned in various historic texts, such as a Shakespearean sonnet: 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,"  Benefits of weed species "What would the world be, once bereft, of wet and wildness? Let them be left.
O let them be left; wildness and wet; Long live the weeds and the wilderness yet. A number of weeds, such as the dandelion Taraxacum and lamb's quarterare edible, and their leaves or roots may be used for food or herbal medicine.
Burdock is common over much of the world, and is sometimes used to make soup and medicine in East Asia. Weeds can also prevent pest insects from finding a crop, because their presence disrupts the incidence of positive cues which pests use to locate their food. Weeds may also act as a "living mulch", providing ground cover that reduces moisture loss and prevents erosion.
Weeds may also improve soil fertility; dandelions, for example, bring up nutrients like calcium and nitrogen from deep in the soil with their tap root, and clover hosts nitrogen-fixing bacteria in its roots, fertilizing the soil directly.
The dandelion is also one of several species which break up hardpan in overly cultivated fields, helping crops grow deeper root systems. Some garden flowers originated as weeds in cultivated fields and have been selectively bred for their garden-worthy flowers or foliage.
An example of a crop weed that is grown in gardens is the corncockleAgrostemma githagowhich was a common weed in European wheat fields, but is now sometimes grown as a garden plant.
Weed seeds are often collected and transported with crops after the harvesting of grainsso humans are a vector of transport as well as a producer of the disturbed environments to which weed species are well adapted, resulting in many weeds having a close association with human activities.
Such species often do well in human-dominated environments as other species are not able to adapt. Common examples include the common pigeonbrown rat and the raccoon.
Other weedy species have been able to expand their range without actually living in human environments, as human activity has damaged the ecosystems of other species.
These include the coyotethe white-tailed deer and the brown headed cowbird. Like other weedy species, humans are widely dispersed in a wide variety of environments, and are highly unlikely to go extinct no matter how much damage the environment faces.
Amaranth — "pigweed" annual with copious long-lasting seeds, also a highly edible and resilient food source Bermuda grass — perennial, spreading by runners, rhizomes and seeds.Resin is like a goody bag to Marijuana users because its a sticky, gooey, liquid which is collected in pipes (Gwinn.
). They scrape it from the crevasses of the pipe and smoke it out of bongs or pipes. Marijuana smoke is also filled with many of the same chemicals as tobacco smoke, including ammonia, hydrogen cyanide, and formaldehyde.
Some of these chemicals are known to cause cancer. Most users smoke pot in a joint or water pipe, so they breathe the smoke straight into their lungs. So, is weed bad for you?
The myriad health effects and benefits of marijuana are likely due to the fact that the plant has about 90 to different active drugs in it.
Some of those might be really helpful and treat things like anxiety, epilepsy, or nausea. The Marijuana Policy Project (tranceformingnlp.com) has complete information about everything to do with marijuana, and the reason it's difficult to say what's bad about marijuana is becau se there isn't anything bad about it--maybe the smoking part-- despite what Ann Landers and the Feds say.
The one and only thing wrong are the Federal Drug Laws that improperly rank it alongside morphine, cocaine and opium.
Reasons they gave included marijuana had fewer unwanted side effects, it managed their symptoms better, and it presented fewer problems with withdrawal. One marijuana user, Conrad, age 47, of San.
THC, but they do not cause the same effect (Mann. pg. 98) This is the main reason marijuana is the most frequently used illegal drug. We Will Write A Custom Essay Sample On Is Weed As Bad As They.