Photo by Melody

PlantFiles: Blue Mist Spiraea, Bluebeard
Caryopteris x clandonensis 'Dark Knight'

Family: Lamiaceae (lay-mee-AY-see-ee) (Info)
Genus: Caryopteris (kar-ee-OP-ter-iss) (Info)
Species: x clandonensis (klan-don-EN-sis) (Info)
Cultivar: Dark Knight

6 vendors have this plant for sale.

14 members have or want this plant for trade.


36-48 in. (90-120 cm)

4-6 ft. (1.2-1.8 m)

USDA Zone 5a: to -28.8 C (-20 F)
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)

Sun Exposure:
Sun to Partial Shade

Unknown - Tell us

Bloom Color:
Dark Blue

Bloom Time:
Late Summer/Early Fall


Other details:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:

Propagation Methods:
From softwood cuttings
By simple layering

Seed Collecting:
Bag seedheads to capture ripening seed
Allow seedheads to dry on plants; remove and collect seeds

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to view:

Thumbnail #1 of Caryopteris x clandonensis by KMAC

By JJsgarden
Thumbnail #2 of Caryopteris x clandonensis by JJsgarden

By Marilynbeth
Thumbnail #3 of Caryopteris x clandonensis by Marilynbeth

By joesinay
Thumbnail #4 of Caryopteris x clandonensis by joesinay

By lupinelover
Thumbnail #5 of Caryopteris x clandonensis by lupinelover

By Xenomorf
Thumbnail #6 of Caryopteris x clandonensis by Xenomorf

By Xenomorf
Thumbnail #7 of Caryopteris x clandonensis by Xenomorf

There are a total of 13 photos.
Click here to view them all!


10 positives
5 neutrals
1 negative

Gardeners' Notes:

Positive virginiarose On Nov 7, 2014, virginiarose from Southeast, VA (Zone 8a) wrote:

Mine got big and floppy, probably because I did not hard prune it in the spring. I sure will next year, this is a nice little shrub but needs some pruning through the growing season to keep a tidy shape, that is if you can get the bees off it long enough to do that. Bees love this plant!

Positive joimack6953 On Feb 3, 2014, joimack6953 from Wheat Ridge, CO wrote:

I hard prune this back late winter or early spring; about 1/3 of the plant; and it blooms beautifully every year. So many bees gather on this plant that I can hear the buzzing when I walk through the garden. It spreads from seed and grows fairly quickly.

Neutral SoNJgarden On Sep 24, 2012, SoNJgarden wrote:

2-yr old plant was hit hard by mildew in July-August. Most leaves fell off- just now starting to make new ones. No blooms this year. Will try hard pruning eary spring 2013. South NJ area.

Positive NoLawns On Aug 26, 2011, NoLawns from Warrenville, IL wrote:

This blue mist shrub needs to be cut down in spring. (4-6 inches) If it is cut back in fall it will die. Also, some dry leaves around the base of the plant in winter will help overwintering success. This plant has grown for many years in Zone 5 (Chicago IL)

Positive xeriman On Sep 22, 2010, xeriman from Farmington, NM wrote:

This shrub has been doing quite well in a few xeric gardens here in northwestern New Mexico (USDA zone 6B or Sunset zone 3A). It is a valuable addition to the gardens because of its late summer blue flowers. Does well in full sun with about 3 to 5 gallons of water (per plant) per week. Not sure of the cultivar. I'm assuming 'Dark Knight'.

Positive Kellysbiz On Sep 6, 2010, Kellysbiz from Mission Viejo, CA wrote:

I bought this gorgeous plant at a local nursery but unfrotuantely it was rootbound to the point of no saving. Once the flowerettes started going to seed they were dying. So I took it back and got another one today. Anyone familiar with Monrovia plants, they tend to be exceptionally rootbound mainly with their five gallon plants. They say their problem with them is solved but I just got this and it isn't. Anyway, I love this plant. I have a blue and white garden area (with a few other colors too that need to be moved) and blue is so hard to find for zone 9. Everyone tends to call some purple colors blue. I completely took apart the roots on this one and then soaked it. Hope it makes it. I'm in Southern California and it's supposed to do well with our heat spells here. Not as bad as Texas but hot for us in the 90's. Plus I'm on the hunt for summer blooming plants for this zone. My garden looks baren from mid-summer to February, yuk. Anyone know any other blue plants that grow here?

Positive jenwaterston On Aug 14, 2010, jenwaterston from Havertown, PA wrote:

This plant comes into bloom (in my Philadelphia-area) garden during mid-August, when many other plants are fading. It's a beautiful blue color and makes a nice specimen plant. I find saplings of this plant all over my full-sun garden -- I've given away and discarded the babies. Seems to thrive in well-drained, full sun conditions.

Neutral karenathurston On May 27, 2009, karenathurston from Philadelphia, PA wrote:

I live in Philadelphia, PA (zone 6a) and planted a 'Longwood Blue' 2 years ago. It flowered the first year but there were no flowers at all last year. The foliage is also not as dense as the majority of photographs I have come across. I have it in morning shade/ afternoon sun in a fairly dry area that I substitute water during the hotter summer months. I'm going to try fertilizing it this summer to see if that helps it improve - it's looking kind of scraggly.

Positive ILUVTX On Apr 19, 2008, ILUVTX from Fort Worth, TX wrote:

Here in Zone8a this plant grows great! It is very beautiful when it blooms in the summer and fall. All our neighbors comment how pretty it is! It is very tolerant of our Texas heat, humidity, and lack of rain in the warm months and does very well over the cooler winter months. I would recommend this plant to other gardeners in a similar climate.

Positive Marilynbeth On Nov 17, 2006, Marilynbeth from Hebron, KY wrote:

I love Caryopteris! I love the blue color of most of the varieties and recently saw that there is a soft pink color of a new variety this year.

Neutral gardenworksva On Oct 17, 2006, gardenworksva from Ruckersville, VA wrote:

Planted Dark Knight Spring '06 and having problems with the stems 'laying down' as well has becoming week and splitting off. Possibly it needs harder pruning early on. ?

Positive Leehallfae On Sep 15, 2006, Leehallfae from Seattle, WA wrote:

I like the True blue flowers. It is next to the Black Hollyhock and Star Gazer Lillies, and adds quite a bit of needed contrast.

Positive Julia_T On May 30, 2005, Julia_T from Northern, VA (Zone 7a) wrote:

I planted three in partial sun in zone 7a last spring. They flowered luxuriantly the same year -- put on a real show, plus the flowers have a delicious scent. The bumblebees agreed, but we didn't get any wasps. Ours have sapphire-blue flowers and soft gray-green foliage, on a mini tree-form habit. I've heard that they can spread quite a bit, so will update if that happens.

Neutral digwell On Aug 25, 2004, digwell from Shelburne, NS (Zone 6a) wrote:

Have just purchased caryopteris Dark Knight, and put it in a bed next to Pee Gee hydrangea. The combination of the Dark Knight blue flowers against the white of the hydrangea is a lovely fresh change from the usual reds and yellows of most late summer flowers.

Neutral MotherNature4 On May 13, 2004, MotherNature4 from Bartow, FL (Zone 9a) wrote:

I just purchased Bluebeard 'Dark Knight' yesterday. Being a native Floridian, this was the first time I've ever heard of this lovely plant, so if anyone else from Florida has any growing suggestions, I'd appreciate any and all input. MotherNature4

Negative lupinelover On Jan 3, 2003, lupinelover from Grove City, OH (Zone 6a) wrote:

Although it is supposed to be hardy to zone 4, this plant is not reliably hardy for me, possibly because of too much moisture in the winter dormant season. The flowers are welcome in the late summer and autumn, but I must replace it every 2-3 years.


This plant has been said to grow in the following regions:

Auburn, Alabama
Chino Valley, Arizona
El Mirage, Arizona
Tucson, Arizona
Knights Landing, California
Oakland, California
Temecula, California
Denver, Colorado
Erie, Colorado
Wheat Ridge, Colorado
Bartow, Florida
Lakeland, Florida
Nampa, Idaho
Rochester, Illinois
Bloomington, Indiana
Floyds Knobs, Indiana
Iowa City, Iowa
Hebron, Kentucky
Monroe, Louisiana
Alfred, Maine
Sandwich, Massachusetts
Dearborn Heights, Michigan
Pinconning, Michigan
Lincoln, Nebraska
Cape May, New Jersey
Millington, New Jersey
Whiting, New Jersey
Albuquerque, New Mexico
Farmington, New Mexico
Poughkeepsie, New York
High Point, North Carolina
Hillsborough, North Carolina
Williamsburg, Ohio (2 reports)
Chiloquin, Oregon
Doylestown, Pennsylvania
Havertown, Pennsylvania
Philadelphia, Pennsylvania
Trafford, Pennsylvania
Barrington, Rhode Island
Simpsonville, South Carolina
Austin, Texas
Canyon Lake, Texas
Fort Worth, Texas
Killeen, Texas
Lewisville, Texas
Farmington, Utah
Kaysville, Utah
Sandy, Utah
Leesburg, Virginia
Portsmouth, Virginia
Ruckersville, Virginia
Cathan, Washington
Issaquah, Washington
North Bend, Washington
Seattle, Washington
Vancouver, Washington
Milwaukee, Wisconsin

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