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Grey-headed Hawkweed

Hieracium triviale

Please keep in mind that it is illegal to uproot a plant without the landowner's consent and care should be taken at all times not to damage wild plants. Wild plants should never be picked for pleasure and some plants are protected by law.
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Plant Profile

Flowering Months:
Asteraceae (Daisy)
Also in this family:
Alpine Blue Sow-thistle, Alpine Cotula, Alpine Fleabane, Alpine Saw-wort, Annual Ragweed, Annual Sunflower, Argentine Fleabane, Autumn Hawkbit, Autumn Oxeye, Beaked Hawksbeard, Beggarticks, Bilbao Fleabane, Black Knapweed, Black-eyed Susan, Blanketflower, Blue Fleabane, Blue Globe-thistle, Bristly Oxtongue, Broad-leaved Cudweed, Broad-leaved Ragwort, Brown Knapweed, Butterbur, Buttonweed, Cabbage Thistle, Canadian Fleabane, Canadian Goldenrod, Carline Thistle, Chalk Knapweed, Chamois Ragwort, Changing Michaelmas Daisy, Chicory, Chinese Mugwort, Chinese Ragwort, Coltsfoot, Common Blue Sow-thistle, Common Cat's-ear, Common Cudweed, Common Daisy, Common Dandelion, Common Fleabane, Common Goldenrod, Common Groundsel, Common Michaelmas Daisy, Common Mugwort, Common Ragwort, Common Wormwood, Coneflower, Confused Michaelmas Daisy, Corn Chamomile, Corn Marigold, Cornflower, Cotton Thistle, Cottonweed, Creeping Thistle, Daisy Bush, Dwarf Cudweed, Dwarf Thistle, Early Goldenrod, Eastern Groundsel, Eastern Leopardsbane, Elecampane, English Hawkweed, Fen Ragwort, Feverfew, Field Fleawort, Field Wormwood, Fox and Cubs, French Tarragon, Gallant Soldier, Garden Lettuce, Giant Butterbur, Glabrous-headed Hawkweed, Glandular Globe-thistle, Glaucous Michaelmas Daisy, Globe Artichoke, Globe-thistle, Goat's Beard, Golden Ragwort, Golden Samphire, Goldilocks Aster, Grass-leaved Goldenrod, Great Lettuce, Greater Burdock, Greater Knapweed, Guernsey Fleabane, Hairless Blue Sow-thistle, Hairless Leptinella, Hairy Michaelmas Daisy, Harpur Crewe's Leopardsbane, Hawkweed Oxtongue, Heath Cudweed, Heath Groundsel, Hemp Agrimony, Highland Cudweed, Hoary Mugwort, Hoary Ragwort, Hybrid Knapweed, Intermediate Burdock, Irish Fleabane, Jersey Cudweed, Jerusalem Artichoke, Lance-leaved Hawkweed, Lavender-cotton, Leafless Hawksbeard, Least Lettuce, Leopardplant, Leopardsbane, Leptinella, Lesser Burdock, Lesser Hawkbit, Lesser Sunflower, London Bur-marigold, Magellan Ragwort, Marsh Cudweed, Marsh Hawksbeard, Marsh Ragwort, Marsh Sow-thistle, Marsh Thistle, Meadow Thistle, Melancholy Thistle, Mexican Fleabane, Milk Thistle, Mountain Everlasting, Mouse-ear Hawkweed, Musk Thistle, Narrow-leaved Cudweed, Narrow-leaved Hawkweed, Narrow-leaved Michaelmas Daisy, Narrow-leaved Ragwort, New England Hawkweed, New Zealand Holly, Nipplewort, Nodding Bur-marigold, Northern Hawksbeard, Norwegian Mugwort, Oxeye Daisy, Oxford Ragwort, Pearly Everlasting, Perennial Cornflower, Perennial Ragweed, Perennial Sow-thistle, Perennial Sunflower, Pineapple Mayweed, Plantain-leaved Leopardsbane, Ploughman's Spikenard, Plymouth Thistle, Pontic Blue Sow-thistle, Pot Marigold, Prickly Lettuce, Prickly Sow-thistle, Purple Coltsfoot, Rayed Tansy, Red Star Thistle, Red-seeded Dandelion, Red-tipped Cudweed, Robin's Plantain, Roman Chamomile, Rough Cocklebur, Rough Hawkbit, Rough Hawksbeard, Russian Lettuce, Safflower, Salsify, Saw-wort, Scented Mayweed, Scentless Mayweed, Sea Aster, Sea Mayweed, Sea Wormwood, Seaside Daisy, Shaggy Mouse-ear Hawkweed, Shaggy Soldier, Shasta Daisy, Shetland Mouse-ear Hawkweed, Shrub Ragwort, Sicilian Chamomile, Silver Ragwort, Slender Mugwort, Slender Thistle, Small Cudweed, Small Fleabane, Smooth Cat's-ear, Smooth Hawksbeard, Smooth Sow-thistle, Sneezeweed, Sneezewort, Spear Thistle, Spotted Cat's-ear, Spotted Hawkweed, Sticky Groundsel, Stinking Chamomile, Stinking Hawksbeard, Tall Fleabane, Tall Mouse-ear Hawkweed, Tansy, Thin-leaved Sunflower, Trifid Bur-marigold, Tuberous Thistle, Tyneside Leopardplant, Viper's Grass, Wall Lettuce, Welsh Groundsel, Welted Thistle, White Butterbur, White Buttons, Willdenow's Leopardsbane, Winter Heliotrope, Wood Burdock, Wood Ragwort, Woody Fleabane, Woolly Thistle, Yarrow, Yellow Chamomile, Yellow Fox and Cubs, Yellow Oxeye, Yellow Star Thistle, Yellow Thistle, York Groundsel
Life Cycle:
Maximum Size:
60 centimetres tall
Cliffs, heathland, meadows, mountains, rocky places, walls.

Yellow, many petals
Yellow dandelion-like flowers.
Unbeaked fruit with a feathery light brown pappus.
Alternate leaves with distinctive, large-toothed edges. Each forward-pointing tooth is widely spaced and ends in a sharp point.
Other Names:
Norrl's Hawkweed.
Frequency (UK):
Occasionally seen  

Other Information


Hieracium triviale, also known as Norrl's hawkweed, is a perennial herb in the Asteraceae family. It is native to Northern Europe, particularly found in Fennoscandia, and Russia. It grows in dry and rocky habitats, such as rocky outcrops and alpine meadows. The plant has basal rosette of leaves and yellow or orange flower heads that bloom from June to September. It is a small plant, growing to around 60cm tall. It is not considered an invasive species or a noxious weed. The plant is also known for its medicinal properties, it has been used in folk medicine to treat a variety of ailments such as skin conditions and wounds.


Grey-headed Hawkweed, scientifically known as Hieracium triviale, is a plant species that belongs to the Asteraceae family. It is native to Europe and has been introduced to other parts of the world, including North America, where it is considered an invasive species.

Grey-headed Hawkweed is a perennial herb that can grow up to 60 cm in height. Its leaves are long and narrow, with a pointed tip and a toothed margin. The flowers are yellow and daisy-like, with several petals surrounding a central disk. They are arranged in clusters at the top of the stem and bloom from June to August.

One of the distinguishing features of Grey-headed Hawkweed is its greyish-white hairy stem and leaves, which give it a distinctive appearance. The plant also has a taproot that can extend up to 20 cm deep into the soil, which helps it to survive in dry and nutrient-poor environments.

Grey-headed Hawkweed is commonly found in grasslands, meadows, and along roadsides. It can tolerate a wide range of soil types, from sandy to clay, and can grow in both sun and shade. The plant spreads through seeds and can also reproduce vegetatively, by producing new shoots from its root system.

While Grey-headed Hawkweed is an attractive plant with its yellow flowers and unique appearance, it is considered a noxious weed in many parts of the world, including North America. It competes with native plant species for resources and can form dense colonies that crowd out other vegetation. In addition, the plant is unpalatable to livestock and can reduce the quality of grazing land.

Efforts to control Grey-headed Hawkweed include manual removal, herbicide application, and the introduction of biological control agents, such as insects and fungi that target the plant. However, these methods can have unintended consequences and may harm non-target species.

Grey-headed Hawkweed, like many invasive species, is able to thrive and spread rapidly in new environments because it has fewer natural predators, pests, and diseases to keep it in check. This is often due to the fact that it is introduced to a new environment where the natural balance of species and ecosystems is disrupted. Without any natural predators, invasive species like Grey-headed Hawkweed can grow unchecked, outcompeting native plant species and disrupting the ecosystem.

In addition to being a nuisance in natural environments, Grey-headed Hawkweed can also cause problems in agricultural areas. The plant's taproot can interfere with the growth of crops and other plants, reducing yields and causing economic losses for farmers.

To prevent the spread of Grey-headed Hawkweed, it is important to be aware of its presence and to take steps to control its spread. This may involve monitoring areas where the plant is known to grow and removing any new plants that are found. In addition, it is important to avoid introducing the plant to new areas by cleaning equipment and vehicles that have been in contact with Grey-headed Hawkweed before moving to a new location.

While Grey-headed Hawkweed may seem like a harmless plant, its impact on the environment and agriculture can be significant. By taking steps to control its spread, we can help protect native ecosystems and agricultural crops from the negative effects of this invasive species.

Another potential impact of Grey-headed Hawkweed is on biodiversity. When an invasive species like Grey-headed Hawkweed displaces native plant species, it can reduce the available habitat and resources for other animals and plants that depend on those native species. This can lead to a reduction in biodiversity and potentially cause harm to entire ecosystems.

In addition, Grey-headed Hawkweed can also have cultural impacts. In some areas where the plant is considered invasive, it may be seen as a threat to cultural practices or traditional land management practices. For example, in some indigenous communities, Grey-headed Hawkweed may be viewed as a sign of ecological imbalance and may be seen as a threat to traditional ecological knowledge.

One interesting aspect of Grey-headed Hawkweed is its potential for medicinal use. Historically, hawkweeds have been used in traditional medicine for a variety of purposes, including treating wounds, respiratory ailments, and digestive issues. While there is limited scientific research on the medicinal properties of Grey-headed Hawkweed specifically, other species of hawkweeds have been found to contain compounds with anti-inflammatory and anti-cancer properties.

However, it is important to note that the potential medicinal use of Grey-headed Hawkweed should be approached with caution. The plant may contain toxic compounds that could be harmful if ingested in large quantities. In addition, the collection of wild plants for medicinal purposes could contribute to the spread of invasive species.

Overall, Grey-headed Hawkweed is an interesting and complex plant species with both positive and negative impacts on the environment and human communities. While it may have potential for medicinal use, it is important to continue to monitor and manage its spread in order to protect native ecosystems and cultural practices. By taking a balanced and informed approach to managing invasive species like Grey-headed Hawkweed, we can work towards a more sustainable and healthy environment for all.