Blueflower Eryngo (Eryngium aquaticum)

Blue flowered eryngo (Eryngium aquaticum) is a perennial with pale whitish-blue to lavender to cornflower blue flowers.  It may reach 1-4 feet tall by 3-4 feet wide so it's best to space plants at least 12 inches to 3 feet apart.  It requires full sun to moderate shade in moist to wet, acidic soil.  It is a great nectar source for pollinators.