Thistles or Cirsium may be best known for their showy purple flowers and pink flowers, in addition to their prickly foliage.

Sow thistle is commonly found in crops, gardens and waste areas. As with many members of the Asteraceae family, it starts life as a rosette, and then bolts to form an upright flower stem. Sow thistle ...

Canada thistle (Cirsium arvense) is an aggressive, invasive plant. Here's how it spreads and how to identify it so it doesn't ...

Winged thistle is a winter annual, which means it generally establishes from seed in autumn, grows as a typical thistle rosette over winter, then develops an upright flower stem in spring, from which ...

It is called a thistle cup because its shape is designed to look like the head of a thistle flower. The base is rounded and the rim turns outwards at the edge, which copies the shape of the flower.

European marsh thistle frequently invades fens, wetlands, and disturbed sites such as roadside ditches. Identifying features include: typically grows 2-7 feet tall leaves are alternate with deeply ...

The Sacramento Mountains thistle is a rare purple flower than can grow to be six feet tall and lives only in wet, high-elevation habitats in the Sacramento Mountains near the town of Cloudcroft, New ...

unlike the leaves and unlike bull thistle and European marsh thistle pink, white, or lavender-colored flowers with flat bracts and pointed tips that bloom in June seed are fluffy, white tufts of hair ...