Eryngium planum ‘Blaukappe’ - Most E. planum varieties are short, but Jelitto bred this tall, intensely blue form that the bumblebees are obsessed with. I leave it standing into the winter because the birds eat the seed heads bare, and what gets missed self-sows, which is useful since these are not particularly long-lived plants (a few years under stress conditions). Great for cutting due to long stems. Soft, rounded leaves form a mostly evergreen rosette (so not really deer proof). Sun, drought tolerant, height 70 cm+.