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Bluebeard

Photo by David J. Stang / Wikimedia Commons - CC BY-SA 4.0

Bluebeard

Caryopteris × clandonensis

A compact, mounding deciduous shrub bred in the 1930s by crossing the East Asian species Caryopteris incana (southern China, Taiwan, Korea, Japan) and C. mongholica (Siberia, Mongolia, northern China) - it has no wild range of its own. Its defining virtue is a flush of vivid blue-to-violet flowers on the current year's growth in late summer and early fall, a period when little else in the garden blooms, combined with aromatic gray-green foliage and exceptional drought tolerance once established. The honest catch is its borderline hardiness at the cold edge of its range: in zones 5–6 the woody stems routinely die to the ground in winter and the plant resprouts from the base each spring, behaving more like an herbaceous perennial than a shrub - gardeners in those zones should hold back pruning until new growth confirms the crown has survived.

Climate fit: narrow (34/100)

Pollinator

Border

Container

Filler

Light

Full sun

Water

Low water

Mature size

2-3.5 ft tall · 3 ft apart

Hardy in zones

5b-9b

very cold to frosty winters

Native status

Cultivated - no wild native range

Related products

Cold hardiness

These values are location-based: this location's current hardiness is the baseline, and the 2050 value is a projected future climate for this same location.

Now

Zone 6b

Plotwright

USDA Zone 6b

-5°F to 0°F

Well-suited

2050

2100

Zone 7a

Plotwright

0°F to 5°F

Well-suited

In plain terms: This location has cold winters. Its winters are projected to keep warming through 2050.

✓

Well-suited today and still thriving in 2050.

Heat tolerance

Heat tolerance values are location-based too: heat days today are observed at this site, and the 2050 value projects this same location under a future climate.

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Where this plant fits

Suitable across 37 ecoregions - 28 climate-resilient through 2070 · 1 suited today · 8 newly possible by 2070. Best matches first.

Appalachian mixed mesophytic forests

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Appalachian-Blue Ridge forests

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Arizona Mountains forests

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Atlantic coastal pine barrens

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Blue Mountains forests

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Central Pacific Northwest coastal forests

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Central-Southern Cascades Forests

Cross-Timbers savanna-woodland

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What it needs

Conditions

Light

Full sun

Water

Low water

Spacing

3 ft

Habit

Compact, mounding, multi-stemmed deciduous shrub with upright to slightly arching stems; dies back to the base in colder parts of its range and regrows each spring

Care tips

•

Prune hard every late winter or early spring - cut all stems back to 6 to 12 inches above the ground or to strong emerging buds. Bluebeard blooms entirely on the current season's new wood; hard pruning is what produces dense, branched stems with the most flower spikes. Skipping the annual cut yields a woody, sparse, poor-blooming plant within a few years.

•

In zones 5–6, hold the pruning cut until you can see new basal growth in mid- to late spring. The top growth often dies back completely in winter; wait for confirmation of crown survival before cutting, and don't give up on a seemingly dead plant until May or June.

•

Drainage before everything else: plant in sharply drained soil and resist the urge to irrigate once established. Crown rot in wet or waterlogged ground is the primary killer - far more damaging than cold.

Lifecycle

Planting

Plant in spring after the last hard frost in a full-sun position with sharply drained soil - well-drained loam is ideal, but lean, sandy, or gravelly soils suit it well. Avoid clay or consistently wet ground, which causes crown rot. Space 3 feet apart to allow the mound to develop good air circulation.

Transplanting

Container-grown plants transplant easily in spring; water to establish through the first season, then taper irrigation. Because the plant blooms on current-year wood, even a freshly transplanted specimen will usually flower the same season once roots settle in.

Early growth

Water regularly through the first growing season to establish, then treat as drought-tolerant. Avoid heavy fertilization, which produces lush, floppy growth with reduced flowering. In zones 5–6 expect the top growth to die back to the ground in winter and resprout from the crown in late spring - do not cut or write it off until growth confirms winter survival.

Maturity

Mature plants form a 2–3.5 ft mounding shrub (occasionally to 4 feet in warm climates) bearing abundant blue to violet flower clusters from August through October on the current season's growth. Performance is sustained by a hard annual pruning each late winter or early spring.

Propagation

Propagate from softwood cuttings taken in early summer, or semi-hardwood cuttings in mid-to-late summer; rooting is easy under mist or humid cover. Named cultivars must be propagated vegetatively to come true. The hybrid does not breed reliably from seed.

Similar plants

Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.

Helichrysum italicum

Curry plant

A dwarf, evergreen Mediterranean sub-shrub with intensely aromatic silver-grey needle-like leaves and clusters of small, long-lasting yellow button flowers in summer. Native to the dry, rocky ground of the western and central Mediterranean basin, it is prized for its bold textural foliage and the illusion of a curry scent - although the plant has no culinary relationship to curry spice and its flavor largely disappears on cooking. The honest catch is hardiness: Helichrysum italicum is reliably winter-hardy only to about USDA Zone 8 (around 10°F); in colder climates it either dies outright or must be overwintered frost-free, and even within its range it is short-lived on heavy, wet soils where winter root rot claims it quickly.

Ballota pseudodictamnus

Grecian horehound

Grecian horehound (Ballota pseudodictamnus, accepted name Pseudodictamnus mediterraneus) is a compact, mound-forming evergreen subshrub native to dry Mediterranean regions of southern Greece, Crete, southwest Turkey, northeast Libya, and northwest Egypt, where it grows on rocky, sun-baked slopes. Its nearly circular, silver-felted leaves and small pink late-spring flowers (largely hidden among the foliage) earn it a place in any drought-tolerant planting, and it holds the RHS Award of Garden Merit. The honest catch is hardiness: while it tolerates brief dips to around 14°F (USDA zone 7b), prolonged wet cold kills it reliably, so in climates with cold, wet winters it must have razor-sharp drainage or it rots at the crown - a combination of frost and wet soil is almost always fatal.

Heather, or ling (Calluna vulgaris), is the low, wiry evergreen shrub that colours the moors and heaths of Europe purple in late summer. It grows only 4 inches to 24 inches tall in dense, spreading mats of tiny scale-like leaves, and from July to September it is covered in spikes of mauve (wild) to white, pink, or red (cultivar) flowers that draw an intense traffic of bees - the source of prized heather honey. It is beautiful, wildlife-rich, and extremely cold-hardy, but it is also a fussy plant with two non-negotiable demands: genuinely acidic soil and cool summers. The honest catches: it will not thrive on chalk or in hot, humid heat (NC State advises against planting south of zone 6), and where introduced - notably New Zealand - it has become an invasive weed.

Shrub

Full sun / Part shade

An old garden-favorite annual native to Mexico, grown for showy daisy-like flowers in nearly every color but true blue - red, yellow, orange, pink, rose, lavender, green, and white. Bushy, leafy plants rise on upright, hairy, branching stems and bloom continuously from early summer to frost. A magnet for butterflies and hummingbirds, and one of the most reliable cut-and-come-again cutting-garden flowers.

Aubrieta (Aubrieta deltoidea) is a low, mat-forming evergreen perennial in the mustard family (Brassicaceae), native to the rocky hillsides of southeastern Europe - primarily Greece, the Aegean Islands, Crete, and adjacent Mediterranean coasts. It is one of the most reliable spring-flowering ground covers for sunny, well-drained spots: cascading sheets of violet to deep pink four-petalled blooms from March through May, attractive to bees and bee flies. The honest catch is that without a hard cut-back immediately after flowering, plants become woody and bare in the centre within two or three years, collapsing from a tight carpet into a tired, gappy mat.

Felicia amelloides is an evergreen, woody-based perennial subshrub native to a narrow coastal strip of South Africa's Western and Eastern Cape, where it colonises stabilising sand dunes, sandy flats, and rocky outcrops at 0 to 3,280.8 feet. In the garden it delivers a near-continuous flush of sky-blue, yellow-centred daisy flowers on neat mounding growth, typically 12 to 24 inches but capable of reaching about 3.3 feet, making it one of the few true blue-flowered plants for sunny pots and borders. The honest catch is frost-tenderness: it survives only light frost in sharply drained soil and collapses below about 23°F, so outside USDA zones 9-11 it must be overwintered under glass or replaced annually - a real commitment in cool-temperate gardens.

Educator packet

Plant packet

Bluebeard educator packet

A compact, mounding deciduous shrub bred in the 1930s by crossing the East Asian species Caryopteris incana (southern China, Taiwan, Korea, Japan) and C. mongholica (Siberia, Mongolia, northern China) - it has no wild range of its own. Its defining virtue is a flush of vivid blue-to-violet flowers on the current year's growth in late summer and early fall, a period when little else in the garden blooms, combined with aromatic gray-green foliage and exceptional drought tolerance once established. The honest catch is its borderline hardiness at the cold edge of its range: in zones 5–6 the woody stems routinely die to the ground in winter and the plant resprouts from the base each spring, behaving more like an herbaceous perennial than a shrub - gardeners in those zones should hold back pruning until new growth confirms the crown has survived.

Scientific name

Caryopteris × clandonensis

Plant type

shrub

Hardiness

5b-9b

Light

full-sun

Moisture

low

Spacing

36 inches

Classroom prompts

- Which plant traits are observations, and which are care recommendations?

- How would this plant fit change if the garden location moved warmer, colder, wetter, or drier?

- Which source-backed facts would you cite in a lesson handout?

Use the Sources & citations section below for page citation styles and the field-level source list.

Sources & citations

Cite this page

For lesson plans, articles, or research that uses this page. Use the source cards below to explore the references that informed this record.

Plotwright. (2026, May 17). Bluebeard (Caryopteris × clandonensis). Retrieved 2026, August 20, from https://plotwright.com/plants/caryopteris-x-clandonensis

Sources used for this record

This record is compiled from the sources below.

RHS Find a Plant

Botanical research database

Open source

Source guide

GBIF

Botanical research database

Open source

Source guide

Wikimedia Commons

Photo · CC BY-SA 4.0