Canada thistle (Cirsium arvense) may sound friendly and indeed it has a lovely purple flower, but gardeners and landowners know better. This prickly perennial weed is a menace and is listed as a ...

Every August this thistle is one of the only plants to flower in most of Spain’s arid Mediterranean habitats, giving it a virtual monopoly on the local bees and other pollinators.

Protect your garden and lawn by attacking invasive thistle. These weeds thrive in hot summer weather, so it is essential to prevent their spread.

All three have flowers very similar to dandelions, so you might think they are just dandies with long, long stems. Like ...

The botanical name for the national floral emblem of Scotland, the thistle, is Onopordum acanthium, and as we all know, thistle plants have sharp prickles.The sharp protrusions can be anywhere on ...

FRESNO COUNTY, Calif. (KFSN) -- Flowers are blooming at Sweet Thistle Farms in Fresno County. This past year, the farm has expanded its flowers, offerings and livestock. "We farm, and I want ...

The flowers of the thistle Carlina corymbosa are, on average, about 3 degrees Celsius cooler than the surrounding air, ecologist Carlos Herrera reports February 13 in Ecology.

Globe thistle’s pale purple to steel blue flowers, held high on stiff stems above coarse dark green foliage, are stealing the show this summer in gardens where they grow. Sea holly is a close ...