Beneficial weed

A beneficial weed is an invasive plant not generally considered domesticated (however, some plants, such as dandelions, in addition to growing wild, are commercially cultivated) that has some companion plant effect, is edible, contributes to soil health, adds ornamental value, or is otherwise beneficial.wikipedia
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Weed

weedsvegetable pestsweedy species
A beneficial weed is an invasive plant not generally considered domesticated (however, some plants, such as dandelions, in addition to growing wild, are commercially cultivated) that has some companion plant effect, is edible, contributes to soil health, adds ornamental value, or is otherwise beneficial.
Many plants that people widely regard as weeds also are intentionally grown in gardens and other cultivated settings, in which case they are sometimes called beneficial weeds.

List of beneficial weeds

beneficial weeds
Some beneficial weeds, such as lamb's quarters and purslane, are edible and highly nutritional. Dandelions, a widespread invasive weed, were introduced to North America originally because they were considered a staple source of food; they were admired for maturing quickly and spreading vastly.
Beneficial weeds can accomplish a number of roles in the garden or yard, including fertilizing the soil, increasing moisture, acting as shelter or living mulch, repelling pests, attracting beneficial insects, or serving as food or other resources for human beings.

Taraxacum

dandeliondandelionsdandelion greens
A beneficial weed is an invasive plant not generally considered domesticated (however, some plants, such as dandelions, in addition to growing wild, are commercially cultivated) that has some companion plant effect, is edible, contributes to soil health, adds ornamental value, or is otherwise beneficial. Some beneficial weeds, such as lamb's quarters and purslane, are edible and highly nutritional. Dandelions, a widespread invasive weed, were introduced to North America originally because they were considered a staple source of food; they were admired for maturing quickly and spreading vastly.
As the dandelion is commercially cultivated as food and as it is highly nutritious, wild-growing dandelions are more often than not considered a free food and a beneficial weed rather than a nuisance.

Beneficial insects

beneficial insectbeneficialgood, predatory ones
A common companion plant benefit from many weeds is to attract and provide habitat for beneficial insects or other organisms which benefit plants.
Beneficial weeds

Domestication

domesticateddomesticdomesticate
A beneficial weed is an invasive plant not generally considered domesticated (however, some plants, such as dandelions, in addition to growing wild, are commercially cultivated) that has some companion plant effect, is edible, contributes to soil health, adds ornamental value, or is otherwise beneficial.

Companion planting

companion plantcompanion plantscompanion crop
A beneficial weed is an invasive plant not generally considered domesticated (however, some plants, such as dandelions, in addition to growing wild, are commercially cultivated) that has some companion plant effect, is edible, contributes to soil health, adds ornamental value, or is otherwise beneficial.

Soil health

healthyhealthy soilshealthy soil
A beneficial weed is an invasive plant not generally considered domesticated (however, some plants, such as dandelions, in addition to growing wild, are commercially cultivated) that has some companion plant effect, is edible, contributes to soil health, adds ornamental value, or is otherwise beneficial.

Benefit

beneficialbenefits
A beneficial weed is an invasive plant not generally considered domesticated (however, some plants, such as dandelions, in addition to growing wild, are commercially cultivated) that has some companion plant effect, is edible, contributes to soil health, adds ornamental value, or is otherwise beneficial.

Wildflower

wildflowerswild flowerswild flower
Beneficial weeds include many wildflowers, as well as other weeds that are commonly removed or poisoned.

Herbicide

herbicidesherbicidalweed killer
Beneficial weeds include many wildflowers, as well as other weeds that are commonly removed or poisoned.

Trifolium repens

white cloverladinoclover
For example, legumes, such as white clover, if they are colonized by the right bacteria (Rhizobium most often) add nitrogen to the soil through the process of nitrogen fixation, where the bacteria has a symbiotic relationship with its hosts roots, "fixing" atmospheric nitrogen (combining it with oxygen or hydrogen) making the nitrogen plant-available (NH4 or NO3). Plants such as ryegrass, red clover, and white clover are examples of "weeds" that are living mulches, often welcomed in horticulture.

Nitrogen

NN 2 dinitrogen
For example, legumes, such as white clover, if they are colonized by the right bacteria (Rhizobium most often) add nitrogen to the soil through the process of nitrogen fixation, where the bacteria has a symbiotic relationship with its hosts roots, "fixing" atmospheric nitrogen (combining it with oxygen or hydrogen) making the nitrogen plant-available (NH4 or NO3).

Nitrogen fixation

nitrogen-fixingfix nitrogennitrogen fixing
For example, legumes, such as white clover, if they are colonized by the right bacteria (Rhizobium most often) add nitrogen to the soil through the process of nitrogen fixation, where the bacteria has a symbiotic relationship with its hosts roots, "fixing" atmospheric nitrogen (combining it with oxygen or hydrogen) making the nitrogen plant-available (NH4 or NO3).

Artemisia (genus)

Artemisiawormwoodsagebrush
Some beneficial weeds repel insects and other pests through their smell, for example alliums and wormwood.

Glechoma hederacea

ground ivyCreeping Charliealehoof
Some weeds mask a companion plant's scent, or the pheromones of pest insects, as with ground ivy, as well as oregano and other mints.

Oregano

wild marjoramOriganum vulgareO. vulgare'' subsp. ''hirtum
Some weeds mask a companion plant's scent, or the pheromones of pest insects, as with ground ivy, as well as oregano and other mints.

Mentha

mintmint leavesmints
Some weeds mask a companion plant's scent, or the pheromones of pest insects, as with ground ivy, as well as oregano and other mints.

Trap crop

[7decoy cropssacrificial plant
Some weeds act as trap crops, distracting pests away from valued plants.

Intercropping

intercroppedintercropinter-cropping
Many plants can grow intercropped in the same space, because they exist on different levels in the same area, providing ground cover or working as a trellis for each other.

Forest gardening

forest gardenfood foresthome gardens
This healthier style of horticulture is called forest gardening.

Living mulch

Conversely, some intercropped plants provide living mulch effect, used by inhibiting the growth of any weeds that are actually harmful, and creating a humid, cooler microclimate around nearby plants, stabilizing soil moisture more than they consume it for themselves.

Lolium

ryegrassrye grassrye
Plants such as ryegrass, red clover, and white clover are examples of "weeds" that are living mulches, often welcomed in horticulture.

Trifolium pratense

red cloverpratensered clover (''Trifolium pratense'')
Plants such as ryegrass, red clover, and white clover are examples of "weeds" that are living mulches, often welcomed in horticulture.

Fungus

fungifungalnecrotrophic
Repel plants or fungi, through a chemical means known as allelopathy.

Allelopathy

allelopathicallelochemicalsallelochemical
Repel plants or fungi, through a chemical means known as allelopathy.