Most gardeners don't have good things to say about thistles. However, sea holly (Eryngium planum), also called flat sea holly, may change that opinion with its stunning steely-blue thistlelike flower ...

Sea holly is a perennial flower known for its striking purple-blue, thistle-like blooms that appear from midsummer to fall. With dark green leaves and an easy-care nature, it thrives in dry to medium ...

Sea holly is a resilient, sun-loving perennial with striking metallic blue blooms that thrives where other plants struggle. It’s drought-tolerant, low-maintenance, and adored by pollinators, making it ...