Evergreen, Perennials, Shrubs
Several species are valuable for interesting leaf patterns and silvery gray or white aromatic foliage (flowers are generally insignificant). Most kinds are excellent in mixed borders, where their white or silvery leaves soften harsh reds and oranges and blend beautifully with blues, lavenders, and pinks. Provide good drainage. Cut nonwoody-stemmed perennials to ground in late fall to rejuvenate; prune back woody perennials and shrubs (into older wood if necessary) before first flush of spring growth. Divide perennials in spring or fall; propagate shrubs by cuttings.
Native to Europe, temperate Asia. Reaches 2–4 ft. tall and 2 ft. wide. Silvery gray, finely divided leaves have a bitter taste and pungent odor. Tiny yellow flowers. Prune to shape. Divide every 3 years. Makes a fine background shrub; a good gray feature in a flower border beside delphiniums. ‘Lambrook Silver’ is 1 1/2 ft. tall with silvery, finely cut leaves.
‘Sterntaler’ has yellow flowers with a reddish brown circle in the center.
Lilac flowers in fall. Orange-red stigma is the true saffron of commerce. To harvest saffron, pluck st...
The most widely grown irises fall into the bearded group. More than a century of breeding has produced...