Top 20 Most Common Weeds in Iceland

Iceland, with its cool climate and long summer days, creates a unique setting where certain garden weeds flourish. Among them, Meadow buttercup, Mouse ear chickweed, and Common groundsel are notably prevalent, often outcompeting domestic plants for resources. Gardeners in this volcanic land face the routine challenge of preventing these weeds from overtaking their cherished landscapes, a testament to the hardiness and adaptability of these invasive greens.

Most Common Weeds

1. Meadow buttercup

Meadow buttercup (Ranunculus acris) is a flowering plant native to Europe. It has gained many nicknames related to its yellow flowers and ubiquity in meadow-like environments. Meadow buttercup is moderately toxic to both humans and livestock.

2. Mouse ear chickweed

Mouse ear chickweed (Cerastium fontanum) is a perennial flowering plant native to Europe, most commonly in Great Britain and Ireland. Mouse ear chickweed is commonly seen naturally growing alongside roadsides and adjacent grasslands. The specific epithet "fontanum" from its scientific name means "fountain", naming after their preference of damping soil and streamsides.

3. Autumn hawkbit

Autumn hawkbit (Scorzoneroides autumnalis) is also called “Autumn Hawkbit.” It’s native to Eurasia, but was brought to North America. Its common name references its resemblance to the common dandelion.

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4. Common groundsel

Common groundsel (Senecio vulgaris) is an annual flowering herb that is related to daisies. Though the flowers resemble immature dandelions, they never "open" the way those other yellow flowers do. Canaries and finches are particularly fond of this plant's seeds and the larvae of several moth species eat the greens. Common groundsel is toxic to humans and some livestock.

Growth Rate:

Rapid

5. Garden sorrel

Garden sorrel (Rumex acetosella) is a flowering plant related to buckwheat. It can be found in acidic soil and tends to grow outside abandoned mines where other plants can't take hold. Farmers will often consider garden sorrel a weed; it is a particular problem for blueberry crops.

Growth Rate:

Rapid

6. Seaside sandplant

The seeds, shoots, and leaves of seaside sandplant (Honckenya peploides) are edible. You can ferment them to make a preserve that’s like sauerkraut. Icelanders make a drink out of it using sour whey. This plant loves to form little clumps on sand dunes by the ocean or to grow on small piles of seashells.

7. Common chickweed

The common chickweed gets its name due to the fact that chickens love to eat it, though they're not alone in that respect. Though it's often considered a nuisance weed, most parts of this plant can be consumed raw or cooked and used similar to spinach. The saponins in common chickweed are slightly toxic but will only have an effect if ingested in huge quantities.

Growth Rate:

Rapid

8. Creeping buttercup

While originally used as an ornamental plant around the world, the creeping buttercup is now considered invasive in many places. Distribution usually occurs through the transportation of hay, making control difficult. The creeping buttercup is considered poisonous and can cause skin blistering.

9. Timothy

Timothy (*Phleum pratense*) is a perennial grass that grows from 61 to 122 cm tall. Timothy is grown for its hay, and it is a favorite of insects and farmers. This species is an irritant to many allergy sufferers. The seed heads are about 40 cm long with spiked flowers that bloom in summer. Caterpillars feed on this grass, and it also provides a habitat for other insects.

10. Bird vetch

Bird vetch (Vicia cracca) is a flowering species of vetch native to Europe and Asia. In North America, bird vetch is considered an invasive species and a weed. In these environments, the flowering plant often grows in industrial disturbed environments like oil fields.

11. Creeping thistle

This aggressive weed spreads across grasslands and fields via underground roots that creep horizontally, some for more than 5 m. It can cause major problems to agriculture if its growth is left unchecked. Its seeds feed many birds as well as pest insects. Creeping thistle is generally considered a noxious weed even in its native territory.

Growth Rate:

Rapid

12. Common plantain

While native to Europe, the common plantain was one of the first plants to reach North America through early European explorers. Native Americans have referred to Plantago major as 'white man's footprint', as it disrupted many local ecosystems by its introduction.

Growth Rate:

Moderate

13. Prostrate knotweed

Prostrate knotweed (Polygonum aviculare) is a low-growing species that can root practically anywhere. It produces many small white flowers each summer and produces plenty of seeds that can survive for years. Its seeds can lay dormant in soils, and once they see sunlight, they will start to germinate. Because it grows so dwarf, mowing is not effective in removing it.

Growth Rate:

Slow

14. Shepherd's purse

Shepherd's purse (Capsella bursa-pastoris) is native to Eastern Europe and Asia minor. Having spread and become naturalized around the world, this herbaceous plant is typically considered a weed. Shepherd's purse is considered a "protocarnivore" because it attracts nematodes (small worms in the soil) and poisons them with its seeds. By eliminating nematodes, this plant enriches the surrounding soil.

Growth Rate:

Moderate

15. Common dandelion

*Taraxacum officinale*, widely known as common dandelion, is a herbaceous perennial that can be found in temperate regions all over the world, in habitats with moist soils. The most popular feature of this plant is its fruits, furry spheres that are easily carried by the wind. Although it is generally considered a weed, common dandelion is actually edible and very nutritious.

Growth Rate:

Rapid

16. Giant hogweed

Giant hogweed (Heracleum mantegazzianum) is a very large, 2 to 5 m tall, herbaceous, flowering perennial with many amusing names - Giant Cow Parsley, Hogsbane, and even Giant Alien. However, names are the only thing funny about this plant - it is a phototoxic invasive species. In combination with light, its sap causes phytophotodermatitis, a serious skin inflammation with blistering and scarring which can last for up to several days.

Growth Rate:

Rapid

17. Curly dock

Rumex crispus, commonly known as curly dock, is a perennial plant that grows in temperate regions of the Northern Hemisphere. It is a very adaptable plant, flourishing in a variety of different habitats including roadsides, the edges of woodlands, meadows, and shorelines. Some moth species like to lay their eggs on curly dock leaves.

Growth Rate:

Moderate

18. Fox-and-cubs

Fox-and-cubs (Pilosella aurantiaca subsp. aurantiaca) is a low-growing plant with shallow fibrous roots. Fox-and-cubs is an aggressive competitor of pasture grasses and has therefore been named as a noxious weed in many areas.

19. Bitter dock

Bitter dock (Rumex obtusifolius) grows wild in shady, temperate areas around the world. Its leaves and stems are edible when young, as are the seeds. It was used in Medieval European folk medicine, and the roots can be used to make yellow dye.

20. Pineapple weed

Pineapple weed (Matricaria discoidea) is a common weed with cute cone shape "flowers", which are actually composed of many tubular yellow-green small flowers. Its leaves give off a sweet smell when crushed. The scent is regarded as somewhere between that of pineapple and chamomile - thus the plant's common names.

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Most Common Toxic Plants

Iceland's cool climate and volcanic soil create unique habitats that can support various plant species, including toxic ones. While the prevalence of toxic plants is not as high as in more diverse ecosystems, concerns exist regarding species like , , and . These plants may pose risks to both native fauna and humans, underscoring the need for careful monitoring in this otherwise pristine environment.

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Most Common Trees

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