Globe Thistle 

Compact, clump-forming perennial with stiff, spiny, dark green leaves, cobwebby above.  From mid-summer bears spherical flowerheads, to 4cm, metallic-blue before the florets open, maturing to a dark blue. Repeat flowering. Fully hardy. Full sun. Best in a poor, well-drained soil. 

Height 90cm Spread 45cm.

2 litre pot.