2' - 3' x 2'
Small, Non-Showy White
Finely Divided Silvery Leaves
Adverse Growth Factors
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.
Artemisia 'Silver Mound'