Hardiness: USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F) USDA Zone 9a: to -6.6 °C (20 °F) USDA Zone 9b: to -3.8 °C (25 °F)
On Oct 23, 2012, garrlau from Indian Springs, NV wrote:
Planted this 2 years ago on a trial basis in rock mulch and poor soil with no access to irrigation in my North Las Vegas backyard. We average only 3-4 inches of rain a year. I watered the plant whenever it started to wilt; usually no more than twice a month even with temps over 100 degrees. It has survived well, growing slowly and staying a tight mound. I expect it would thrive with a more regular water supply.
On May 6, 2011, Fires_in_motion from Vacherie, LA (Zone 9a) wrote:
This plant has an astounding rate of growth if kept in rich soil in a subtropical climate, even with zero supplemental watering. Mine has gone from a tiny 1/2 gallon plant (cutting) to a huge beanbag-chair-sized behemoth in about 8 months. After cutting it back aggressively, it has rewarded me with a slightly more upright regrowth habit. Several neighbors have asked what it is, and I gave a naturally-layered cutting/pup to one. I bought this cultivar because it comes recommended in Dan Gill's Louisiana gardening book as one of the few Artemisias that tolerates our humid/wet climate.
Within one season, this was a full, beautiful plant that is evergreen here. Shearing it is OK for the first spring following planting when it puts on new growth, but I would encourage you to cut it back to about 10" the following year, making sure to leave some branches where you can actually see new leaf growth appearing below it. If you cut it back below the area of new growth or if you cut it back too soon, it may well die. I let mine go with shearing an additional year, but it was so woody that I was really sick of it by the following year. Don't cut it back in the fall. It is not invasive but is a sprawler if you don't cut it back every other year or so.
On Apr 6, 2010, flying_squirrel from Priest River, ID (Zone 5b) wrote:
This plant is striking on a hot, dry south facing slope with other xeric plants. (Agastache, russian sage, pentstemons, kashmir sage, coreopsis etc) The soil has lots of clay and I try to add sand to the soil for certain plants, such as this one. This area is quite cold in winter(has been down to -25F) with the powis castle surviving. I think snow cover, or lack thereof is a big factor in the results. We just came through an unusually warm(for here) winter which caused more plants to be exposed to wet/slush and then freeze/thaw. So I am waiting to see how the powis castle survived. I know at least one did and may provide a bit of protection in the future if warrented. The deer don't touch this plant which is a huge plus. (Have had as many as 4 dozen in the adjacent field so the pressure was high.) Pruning it back in the spring is a key to having a full, bushy plant by summer. At any rate, I love this plant!
On May 25, 2009, anelson77 from Seattle, WA wrote:
planted 2 years ago in sun, good soil, no extra water. Grew very fast to about 4 feet across and 2 feet tall, and looked great for about a year and a half. Very silvery, nice smelling, touchable looking plant. This winter it started looking really leggy so I cut it way back to about a foot high. It looked ugly with awkward bare stems for the early part of the spring but by May had filled in nicely.
On May 10, 2009, jeff0452 from Rio Rancho, NM wrote:
We have grown a couple of these in a very sunny, dry spot. They have grown larger every year, and require little water and almost no care. Foliage is a nice silvery color, and full. Plant them in a spot where they have some room to get bigger. We do cut a little dead foliage off once a year, and deadhead after the little yellow flowers are done.
On Jun 29, 2008, leapchair from Waterford, MI wrote:
I had a Powis Casle for two years and loved it, so bought several more last year, but lost almost half of them over the winter. The ones that didn't die are much smaller than they were last summer, coming in on only one branch of each. I live in SE Michigan, zone 6a, and we did NOT have a bad winter last year. I have them in full to part sun in good sandy loam soil. Can anyone explain why this might have happened? I don't know whether to try again.
On May 20, 2008, TrishaG from Englewood, CO (Zone 5b) wrote:
I grow this plant hot & dry, and by summer I have a silver shrub 3' tall x 4-5' wide, compact foliage, excellent contrast to any brightly colored flowers. Early spring I cut it back to the main branches about 6-8" off the ground, and soon the new foliage fills in green. As summer heats up it goes silver and stays silver through winter. No pests or diseases, no pruning, no watering, no fertilizing.
On Oct 1, 2006, lakeshoredrive from Chicago, IL wrote:
The texture and color of this artemisia makes a wonderful addition in the landscape. I have planted it in various locations, sun, half day sun, wet clay, well-drained even sandy soil and all of my plants transplanted well and grew nicely, but none of them made it through chicago winters. I doubt this plants hardiness here.
On Jun 5, 2005, pirl from (Arlene) Southold, NY (Zone 7a) wrote:
A lovely accent plant that can help to hide the dying foliage of many bulbs. It does need a shearing once in a while and then it's ugly for a week or so. On the whole I like it, especially the fine cut foliage.
On Jun 4, 2005, michaeladenner from Deland, FL wrote:
Attractive, fern-like silvery foliage -- a nice background for flowers. Mine serves as an understorey for roses, and perennials that tend to get leggy. It throws out long (2-4') stems that can go bare at the center as the long summer in Florida (USDA zone 9a) comes to an end. The upside to this growth habit is that you can air-weave (propagate) these long, leggy stems by slightly abrading the stem and burying it (I use a landscaping staple, but a y-shaped stick would do the trick). Can unify a bed. Not at all invasive like Silver King, another cultivar of Artemisia.
Highest recommendation for a low-care, foliage plant in an annual or perennial bed where, say, lambs ear wouldn't survive.
My first year with this plant, having installed 4" pots, was very good. Had them in a sunny area, didn't need much water. The second year they took over the perennial bed. I didn't do any pruning back and by the winter, when I went to cut back the bare twiggy growth, a lot of the less aggressive perennials had been killed off by lack of light from the artemisia.
Still, very attractive foliage, in season, but overly aggressive and looks poor out of season.
On Aug 29, 2004, smiln32 from Oklahoma City, OK (Zone 7a) wrote:
To keep the plant dense and compact, keep it pruned all summer. Prune it back only once a year, in late winter, leaving short ( 12 inches) woody stems with lots of buds. Do not prune in summer, so the plant is spreading but full.
'Powis Castle' may also be used as an accent near taller shrubs because of its neat, mounding growth habit.
On Apr 4, 2004, docaly from Albuquerque, NM wrote:
This baby turned out to be a showstopper in my NM garden. I planted it from a 4" pot and in one season it got to be about 3-1/2 feet tall by about 4 feet around. It was huge and beautiful, tall and tempting for its fabulous fragrance, and always receiving praise from many admirers besides me! It received full western sun in a xeri bed along rock and wildflowers and just prospered! The flowers on it were so pretty!
Given an annual haircut, it bounces back and gets bushier -- a fantastic plant as filler, background or specimen! Definitely a keeper!
I have a number of different artemisias which seem to thrive in my hot dry climate and alkaline soil. Powis Castle is one of my favorites - it never gets leggy and is a tidy mound of pleasantly pungent silver foliage. Another bonus is that the deer leave it alone. I have some drumstick alliums growing up through one and it is quite striking with the magenta globes appearing to be flowering on the Powis Castle.
On Sep 22, 2002, mystic from Ewing, KY (Zone 6a) wrote:
Has yellow blooms in late summer but it's best to remove the flowers. This plant was given to me as a small plant in the spring and it's really gone wild. Sure adds some nice color in the garden this time of year.
On Jul 27, 2002, darius from So.App.Mtns. United States (Zone 5b) wrote:
I have several of these and love them in my beds or stand-alone. No pests, no problems that I know.
This plant has been said to grow in the following regions:
, (2 reports) Gaylesville, Alabama Madison, Alabama Union Grove, Alabama El Mirage, Arizona Glendale, Arizona Peoria, Arizona Phoenix, Arizona Rimrock, Arizona Elk Grove, California Fallbrook, California Forest Falls, California Fresno, California Gold River, California Hesperia, California Palm Springs, California Santa Ana, California Sheridan, Colorado Old Lyme, Connecticut Townsend, Delaware Havana, Florida North De Land, Florida St Petersburg, Florida Atlanta, Georgia Braselton, Georgia Broxton, Georgia Marietta, Georgia Roswell, Georgia Stone Mountain, Georgia Hailey, Idaho Priest River, Idaho Chicago, Illinois Jonesboro, Illinois Mount Prospect, Illinois Oak Park, Indiana Olathe, Kansas Ewing, Kentucky Jefferson, Louisiana North Vacherie, Louisiana Londontowne, Maryland Maben, Mississippi Madison, Mississippi Mathiston, Mississippi Belton, Missouri Las Vegas, Nevada North Las Vegas, Nevada Bloomfield, New Jersey Albuquerque, New Mexico Los Ranchos De Albuquerque, New Mexico Rio Rancho, New Mexico Clinton Corners, New York Himrod, New York Montauk, New York Southold, New York Yonkers, New York Kure Beach, North Carolina Raleigh, North Carolina Edmond, Oklahoma Stillwater, Oklahoma Eagle Point, Oregon Hermiston, Oregon Rockcreek, Oregon Trafford, Pennsylvania Elizabethton, Tennessee Madison, Tennessee Union City, Tennessee Abilene, Texas Alma, Texas Austin, Texas Brenham, Texas Bulverde, Texas Cedar Hill, Texas Conroe, Texas (2 reports) Dripping Springs, Texas Galveston, Texas Hudson Oaks, Texas La Vernia, Texas Lost Creek, Texas Montgomery, Texas Murphy, Texas Port Lavaca, Texas Richmond, Texas San Antonio, Texas Scenic Oaks, Texas Tyler, Texas Wells, Texas Farmington, Utah Arlington, Virginia Charlottesville, Virginia West Springfield, Virginia Battle Ground, Washington Cascade-fairwood, Washington Lake Goodwin, Washington Twisp, Washington Cross Lanes, West Virginia