Cirsium vulgare
Bull Thistle
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Bull Thistle (Cirsium vulgare) - Description
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.
Bull Thistle (Cirsium vulgare) - Blooming
Their flowers are known for having subtending "spines", but not all species have them. Flowers, borne in early and mid-summer, can be purple, red, yellow, and sometimes white. For earlier bloom, start seeds indoors in a well-lighted area 6-8 weeks before last spring frost.
Bull Thistle (Cirsium vulgare) - Growth
Biennials and perennials. Most Thistles do well in climates that have hot, dry summers. Grows best in full sun. Fast-spreading by way of rhizomes or self-seeding. Species, such as C. japonicum and C. rivulare, are suitable for borders or damp meadows in a wild garden.
Bull Thistle (Cirsium vulgare) - Planting
Can be seed sown. Freely self-sows and can become quite weedy. Conduct division of perennials between fall and spring. Division entails propagating a plant by splitting it into 2 or more parts. Each part has its own root system and more than one shoot or dormant bud.
Bull Thistle (Cirsium vulgare) - Pest
Common problems include powdery mildew and rust.
Bull Thistle (Cirsium vulgare) - Interesting facts
Cirsium occurs in an array of habitats such as streamsides, moorland meadows, and grassy mountain slopes. There are around 200 known species, most of which are invasive.
Bull Thistle (Cirsium vulgare) - Soil and irrigation
Tolerant of many soil types, but generally perform best in well-drained soils that are kept moist.
