Aside from cobwebby thistle, field thistle (Cirsium discolor) and tall thistle (Cirsium altissimum) are commonly found in North America. These native thistle plants are interesting in appearance ...

Bull thistle starts out life as a prickly ground-hugging rosette that, in the summer, puts out tall, equally spiny stalks topped with purple flowers. Later, fluffy white seed heads form.

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 ...