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The striking spikes of Eryngium (commonly called sea holly) display metallic-blue, steel-blued or silvery thistle-like flower heads atop spiny, textured foliage—offering bold structure and long-season interest in the garden. These hardy perennials thrive in Canadian settings when planted in full sun on poor to moderately fertile, well-drained, dry or sandy soils—avoiding rich, moist or clay soils to ensure health and form. With strong drought tolerance once established and deer-resistant spiny form, they are well suited for rock gardens, coastal beds, dry borders or contemporary landscapes. Explore our Wildwood Express sea holly collection to bring architectural form, shimmering colour and low-maintenance resilience to your garden.
