Marin Master Gardeners
University of California
Marin Master Gardeners

Plant Guide

Artemisia 'Powis Castle'

Common Name
Wormwood
CA Native
Non-native
Plant Type
Perennial
Size
2' - 3' x 2'
Flower Color
Small, Non-Showy White
Bloom Time
  • Summer
Leaves
Finely Divided Silvery Leaves
Evergreen
Evergreen
Deer Resistant
Rarely Damaged
Wildlife Value
Growth Rate
Moderate
Hardiness
Hardy
Adverse Growth Factors
None
Special Features
  • Fragrance
  • Low Maintenance
Water Use
  • Drought Tolerant
  • Low
Soil pH
6.5-7.5 (neutral)
Exposure
  • Full Sun
Soil Type
Not Particular
Drainage
Well Drained
Description and Cultural Plant Tips

'Powis Castle' is a lovely  mounding perennial grown mainly for its aromatic silvery foliage. Foliage may be sheared in summer to shape.  Looks good in a mid perennial border. Companion plants include; Echinacea , Acrtotis, and  Agastaches varietals, Salvia nemorosa varietals, Salvia greggii, Teucrium chamaerdrys and Zauschneria californica.

Grows in poor to moderately fertile, well-drained soil. Add compost to native soil to increase drainage & improve soil texture. Prefers neutral to slightly alkaline soil pH's. Tolerates hot, dry conditions. Drought tolerant once established. Susceptible to root rot so excellent drainage is a must. Spreads by underground rhizomes so it can be invasive in moist environments.

Prune in spring but be careful to leave sufficient live buds on each stem to facilitate bushy growth. Never prune to ground.

Has no serious pests or diseases.

 

Master Gardener Comments

This plant is a lovely contrast to the dark blue or purple salvias, such as S. guaranitica  'Black & Blue'  or with Z. californica. Also looks good with pink coneflowers. I also use it on dry hillsides as it is very tolerant of hot, dry conditions. 

Varietals

Artemisia 'Silver Mound'

Top of page

Webmaster Email: banielsen@ucanr.edu