thistle cirsium vulgare aka bull thistle, nodding thistle, milk thistle natural environment

thistle pink herb herbal purple plant cirsium bud blossom weed wild milk natural environment flower scottish prickly silybum sharp silymarin spear spine spiny thorn violet vulgare wildflower national onopordum asteraceae bull delicate blooming invasive flora nodding cluster bloom helenioides homeopathic fluffy marianum common floral damann inflorescence heads