Spear Thistle is often a ruderal species, colonising bare disturbed ground, but also persists well on heavily grazed land as it is unpalatable to most grazing animals. The flowers are a rich nectar source used by numerous pollinating insects, including Honey bees, Wool-carder bees, and many butterflies. The seeds are eaten by Goldfinches, Linnets and Greenfinches. The seeds are dispersed by wind, and possibly also by ants; they do not show significant long-term dormancy, most germinating soon after dispersal and only a few lasting up to four years in the soil seed bank. Seed is also often spread by human activity such as hay bales.
Cirsium vulgare (Spear Thistle) is a species of the genus Cirsium, native throughout most of Europe (north to 66°N, locally 68°N), western Asia (east to the Yenisei Valley), and northwestern Africa (Atlas Mountains). It is also naturalised in North America and Australia and is as an invasive weed in some areas.
What strikes me most in this flower is its mathematical structure. Every details seems to follow some kind of algorithm.