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You know that old saw about plants -- "thrives on neglect"? It must have been created for sea holly. It does best in poor soil with little water and baked conditions. Yet it has striking flowers, an interesting prickly texture, excellent drought- and deer-resistance, and even salt-tolerance. Plants form taproots, so they are difficult to transplant once established, but starting new ones from seed is easy. Remove spent flowers to prevent excess self-seeding.
The silvery foliage of yarrow combines beautifully with that of sea holly. Yellow flowered forms look especially attractive with the purplish blooms of sea holly.Artemisia
The striking upright mounds of sea holly look great surrounded by soft, silvery white artemisia foliage.Daylily
Daylily is another tough-as-nails plant to grow with sea holly in inhospitable sunny sites. Choose from the many colors available to coordinate with lavender sea holly.