Spear thistle

What does Spear thistle look like?

Spear thistle grows upright, reaching up to nearly 2 metres tall. Its leaves are grey-green, deeply lobed, and lined with sharp spines. The plant forms a rosette of leaves in its first year, then sends up a flowering stem. Its flower heads are round, 2.5–5 cm across, and show a pink to purple colour. The stems have narrow, spiny wings running along their length. Seeds are small and attached to feathery hairs, helping them travel on the wind.

Where does Spear thistle come from?

This thistle is native to most of Europe, stretching north to the Arctic Circle, as well as western Asia and the Atlas Mountains of northwestern Africa. It has spread widely and now grows in North America and Australia, where it is often considered an invasive weed. The plant thrives in disturbed soils and open ground, and its name comes from the spear-like shape of its leaf lobes.

When and how Spear thistle blooms

Spear thistle usually lives for two years, forming a leaf rosette and deep taproot in the first year, then sending up a tall flowering stem in the second. It can sometimes flower in its first year. The plant prefers nitrogen-rich soils and open, disturbed areas. It reproduces only by seed, which is carried by wind, water, animals, or human activity.

How Spear thistle is used

While often unwanted in fields, spear thistle is valued for its nectar, attracting bees and butterflies. Its seeds feed birds such as goldfinches and linnets. In rural Italy, dried flower heads are used to curdle goat’s milk for cheese. In Iran, the stems are cooked in stews, and in Cajun cooking, the peeled stems are pickled. In Scotland, it appears in traditional ceremonies.

Kinds of Spear thistle

There are several related thistles, such as marsh thistle (Cirsium palustre), but spear thistle is notable for its tall size and spiny leaves. It sometimes behaves as an annual, flowering in its first year, but usually follows a biennial cycle. Other names reflect its appearance and cultural ties, especially in Scotland.

What Spear thistle means

Spear thistle is a national symbol of Scotland and features in events like the Riding of the Marches in Langholm. It is also used as a local emblem in some English villages. The plant is important for wildlife, ranking high in nectar production for pollinators in Britain. Despite being labelled a weed in some places, it plays a role in both nature and tradition.

Questions people ask about Spear thistle

Good reading and sources

• Cirsium vulgareUS Department of Agriculture, Article
• Cirsium vulgareRoyal Horticultural Society, Article
• Plants of the World OnlineRoyal Botanic Gardens, Kew, Plant database
• Where it has been recordedGBIF, Plant database
• Sightings and photos by naturalistsiNaturalist, Plant database

• Cirsium vulgare on WikipediaEncyclopedia
• More photos on Wikimedia CommonsPhotos
• Wikidata recordOpen data