ARTEMESIA (Wormwood, Mugwort, Silverplume) Compositae A. species
HABITAT: Native to Asia, Europe, N. America. Zones dependent on species.
USES: Foliage, rock gardens, borders, herb gardens.
HABIT: Small annual and perennial shrub with alternate, deeply cut leaves and small white or yellow flower heads.
SEED GERMINATION AND CULTURE: Sow seed producing types (chiefly annuals) outdoors after danger of frost has passed, cover lightly and keep moist during the germination period. Thin to 12-18" apart. Sow the seed in flats and place in a warm location about 70°F. Keep seed moist and covered lightly; transplant when large enough to handle; set out in a permanent location when roots emerge from pot walls.
Set out in sun to light shade during the spring, 12-18" apart in an average garden loam with excellent drainage being a must. Artemesia can tolerate dry, poor soil but moisture is important during the growing season.
Clumps rarely spread and are usually left undisturbed. Protect with a mulch of hay, straw, etc. in northern zones.
SPECIES: A. abrotanum (Southernwood). 4'. Zone 5. Finely divided, aromatic foliage. Southern Europe.
A. absytheum (Common Wormwood). 4'. Zone 3. Coarse, white, silky, hairy, deeply divided leaves. Fall: yellow to purplish flowers on long narrow branches. Seed, division, cuttings. Europe.
A. albula `Silver King' (Ghost Plant). 2 1/2'. Zone 5. Silver/gray foliage. Texas-California.
A. annua (Sweet Annie). 4-5'. Annual. 1-2 1/2" pale green leaves, divided and very fragrant. Tiny yellow flower heads in loose, profuse panicles, August-September. Asia.
A. dracunculus (Tarragon). 2'. Zone 5. Herb. Aromatic foliage.
A. frigida (Fringed Sagebrush). 1 1/2'. Zone 2. Silvery, shiny, finely divided aromatic foliage. Rock gardens. Small yellow flowers, late August. Midwest USA.
A. glacialis (Glacier Wormwood). 4". Zone 4. Dense, mat-like with deeply lobed, white woolly leaves and creeping stems. Coarse, gravely soil. Wall plant and used between stepping stones. Alps.
A. lactiflora (White Mugwort). 4-5'. Zone 3. Tiny fragrant creamy flowers, mid-late summer. Dark green leaves with silvery undersides. China.
A. ludoviciana (Western Sage). 3'. Zone 3. Underground root stocks. Stems with fine, white hairs and leaves varying in shapes. Leaves usually with white undersides. Flowers in loose panicles. W. USA.
A. schmidtiana (Silvermound Artemesia, Satiny Wormwood). 2'. Zone 3. Foliage with silvery white hairs and deep cut and divided. Variety "nana" 4", good rock garden plants. Japan.
A. stelleriana (Beach Wormwood, Dusty Miller). 2 1/2'. Zone 3. Seashore. Densely white, woolly, and finely divided foliage. Small yellow flowers in compact racemes. E. N. America.
A. tridentata (Sagebrush). 9'. Zone 5. Silvery gray, aromatic foliage.
A. vulgaris (Mugwort). 3 1/2'. Zone 3. Very divided, fragrant, alternate leaves, green above and white woolly underneath. Grayish flowers on branched axillary spikes, July-September. Europe, Asia.
INSECTS: Nematodes: Treat soil with Nemagold Marigold treatment.
Aphids, Scale: Use an approved insecticide such as Malathion.
Beetle, Grasshoppers: Use an approved insecticide such as Malathion.
Mealy Bug: Use an approved insecticide such as Malathion or Sevin.
Mites, Psyllid, Thrips: Use an approved insecticide such as Malathion or Diazinon.
DISEASES: Downy Mildew, Blight, Leaf Gall, White Rust: Use an approved fungicide such as Maneb or Zineb.
Powdery Mildew, Rust: Use an approved fungicide such as Maneb or Benlate..
PROPAGATION: Cuttings, division, seed (seldom).