Ideal Sun Conditions:
Low water-use non-native hybrid shrub (Artemisia arborescens x Artemisia absinthium) from Europe and Asia. Vigorous grower, do not overwater. Coldy hardy to Zone 6. Ever-silver with elegant finely cut leaves. 'Powis Castle' is named for Powis Castle in Wales. Rarely flowers.
Use in Garden
Grows to a rounded mound in a xeric area to 3 to 4 feet across, give it plenty of room. Paired with Engelman's daisy, it'll provide season long color contrast. Excellent for a white or silver moonlight garden.
Cut back in early spring to about a third it's size to keep it neat and compact. Can be trimmed back more severely if necessary.