Cirsium rivulare 'Atropurpureum'

brook thistle

• Position: full sun
• Soil: moist, well-drained
• Rate of growth: average to fast-growing
• Flowering period: July and August
• Hardiness: fully hardy
  
  Spectacular, deep crimson thistles appear on erect spectacular, deep crimson thistles appear on erect stems in July and August above spiny, dark green leaves. This handsome, towering thistle is a valuable addition to a summer garden and looks equally at home in a wildflower meadow, beside water or in groups among other perennials. Although it will tolerate dry conditions and partial shade, it does best in a moist, sunny border.
  
  
• Garden care: Divide congested plants from autumn to spring and cut back to the ground in autumn to prevent self-seeding.