This plant has become a favorite of mine in the Adelphi Garden. It seed around but never to the point where it feels unmanageable. I've grown many of the other cultivars and hybrids from this group and they don't have the staying power this one does. Forming tight gray mounds of evergreen foliage, it adds an element of structure to the mixed border in the winter. Frost or dew ornament it particularly attractively and large green flower heads are striking accents in early spring. It hasn't moved far for me in, I think 12-15 years but I do wonder what it might do in a more favorable area? It could be a plant to watch.
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