Eryngium planum 'Blaukappe'

In floral arrangements, sea hollies look very exotic. But they have been very easy to grow in our experience. All they need to thrive are lots of sunlight and well-drained garden soil. The icy blue coloration runs not only through the flowers but also through the bracts and down the stems. They stand out against warm-toned perennials; our favorite pairing is 'Blue Cap' sea holly and 'Summer Pastels' yarrow.