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Dandelions (*Taraxacum*), a common beneficial weed

This is a list of undomesticated or feral plants, generally considered weeds, yet having some positive effects or uses, often being ideal as companion plants in gardens.

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.

Chart

Beneficial weed chart
Common name	Scientific name	Companion plant for	Attracts/hosts	Repels	Traps	Edibility	Medicinal	Avoid	Comments
Bashful mimosa	Mimosa pudica	Ground cover for tomatoes, peppers	predatory beetles						Used as a natural ground cover in agriculture
Caper spurge	Euphorbia lathyris			Moles			Used in French folk medicine as an emetic and purgative^[1]		Many domesticated animals can eat it, although it is poisonous to humans.^[1]
Primarily edible
Nettle	Urtica dioica	Broccoli, tomato,^[2] valerian, mint, fennel				Despite its "sting", young plant parts are edible, as is much of the plant when blanched or otherwise prepared. It can be used to make herbal tea			Also once grown as a crop for its fiber. Its juice was once used in the place of rennet in cheese-making. It was also a source of "green" for dye. It can still be used as a high-protein additive in animal feed, once dried. Nettles prefer soils rich in nutrients beneficial to other plants—particularly nitrogen and phosphorus—and thus can be useful indicators of soil quality.^[3]
Crow garlic	Allium vineale	fruit trees, nightshades (tomatoes, peppers, potatoes, etc.), brassicas (cabbage, broccoli, kohlrabi, etc.) carrots		slugs, aphids, carrot fly, cabbage worms^[4]		Can be used like conventional chives		beans, peas, parsley	This is a wild cousin of onions and garlic
Wild mustard	Brassicaceae	Grape vine, radish, non-mustard brassica, including cabbage, cauliflower, broccoli	Ladybugs		Traps various brassica pests, including aphids	Seeds and leaves are edible		beets	Domesticated mustard is a hybrid of three different species of wild mustard, all of which are still used in some places for food. This is known as the Triangle of U.
Wild rose	Rosa	Strawberries, grapes, roses		Rodents and deer	Traps Japanese beetles	Rose hips can be used in herbal teas			This includes the feral multiflora rose, brought to the US ^[5] both for use as root stock for domesticated roses, and as a "natural fence" for livestock. In the mid 20th century miles of multiflora rose hedge were planted in sequence.
Improves environment for nearby plants
Borage	Borago officinalis	legumes, brassicas, tomatoes	Its flowers attract predatory wasps			crunchy leaves and flowers can be consumed in salads	Borage is one of the most widely-touted traditional medicinal herbs in Europe.
Dandelion	Taraxacum	Any garden plant	Its flowers attract pollinators			all parts of the dandelion are edible in season	Used in traditional herbal medicine throughout the world. The common dandelion (Taraxacum officinale) contains chemicals that are known to have diuretic properties.^[6]		Dandelions benefits nearby plants through their powerful tap root system. It breaks up hard soil, going deep into the ground, then brings up nutrients other plants could not reach.
Clover	Trifolium	brassicas like cabbage and broccoli	Its flowers attract pollinators			Leaves can be eaten	Used in traditional herbal medicine to "cleanse the blood" and contains micronutrients that may help with gout	Do not grow around tomato plants, clover is a legume that makes the soil too fertile. Tomato plants need a mild nitrogen deficit to set fruit	Clover, like most legumes, hosts bacteria that fix nitrogen in the soil, helping fertilize nearby plants. Clover also provides ground cover, helping retain water in the soil as a "living mulch", and protecting nearby crops from predation by insect pests. Bare earth gardening makes it easier for insects to home in on plants to destroy, the green of the clover prevents this.

Categories of beneficial weeds

Pest-repellent

Neem—repels leaf eating insects

Edible

Blackberry—blackberries are rich in nutrients, and their thorny stems can form a barrier against some larger pest mammals.
Burdock—roots are edible (as are the stalks, but particularly the young leaves^[7]).
Chickweed (Stellaria media)—used in salads and also as ground cover.
Cornflower—various colors; can be served as edible garnish to decorate salads.
Flatweed—leaves are edible raw, while roots are edible after being roasted.^[8]
Horsetail—primeval plant that is high in silica; tops are very similar to and may be eaten like asparagus.
Lamb's quarters—leaves and shoots, raw, also prevents erosion, also distracts leaf miners from nearby crops.
Nettle—young leaves collected before flowering used as a tea or spinach substitute. Plants have use as compost material or for fibre.
Purslane—prepared raw for salads or sautéed.
Shepherd's purse—leaves are edible and often sautéed or blanched.
Watercress—can be eaten raw or cooked; is considered a weed in some cultures (caution required when harvesting wild because of the risk of contracting potentially fatal liver fluke).

Habitat for beneficial insects

Wild blackberry—attracts predatory insects, and produces berries.
Motherwort—attracts bees.
Joe-Pye weed—habitat for pollinators and predatory insects.
Aster—habitat for predatory insects.

Shelter plants

Normal grass can be used as ground cover, especially in nitrogenous soils.

Trap crops

Trap crops draw potential pests away from the actual crop intended for cultivation.

Cowpea—attracts ladybird beetle, so planting around cotton fields protects them from sucking insects. It serves as source of food and niche.

Chart

Categories of beneficial weeds

Pest-repellent

Edible

Habitat for beneficial insects

Shelter plants

Trap crops

See also

Organic approaches

Indexes

References

Bibliography