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King protea

King protea

Protea cynaroides
A sculptural evergreen fynbos shrub bearing the largest flower head of any protea - a great goblet of pointed pink bracts wrapped around a dense central boss - and the national flower of South Africa. Leathery, rounded leaves clothe a woody, fire-adapted rootstock. It is native to the Cape Provinces of South Africa, the Cape Floristic Region / fynbos (POWO, Kew), and is FROST-TENDER: RHS rates it tender (H3), hardy only to about 25°F briefly, so outside warm-temperate / Mediterranean climates it is grown under glass or in a sheltered, sharply-drained spot. Like all Proteaceae it is PHOSPHORUS-SENSITIVE - it evolved on nutrient-poor fynbos soils with cluster (proteoid) roots, and ordinary phosphate fertiliser or BONE MEAL will kill it. In the wild the nectar-rich heads are bird-pollinated, worked by sunbirds and sugarbirds. Grown ornamentally and as a premier cut flower; it is not a food plant.
Climate fit: narrow (38/100)
Focal point
Structure
Pollinator
Light
Full sun
Water
Low water
Mature size
3-6 ft tall · 5 ft apart
Hardy in zones
9a-11
frosty to nearly frost-free winters
AHS heat range
2-11
Plant range authored in AHS heat-zone terms.
Native in Illinois
No
In its South African fynbos habitat the nectar-rich heads are BIRD-pollinated - sunbirds and sugarbirds feed at the central boss and carry pollen between heads - but those birds are not present in most gardens elsewhere, where the plant is enjoyed purely for its flowers and form.

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
Won't grow here
Zone 7a
Plotwright
0°F to 5°F
Won't grow here
In plain terms: This location has cold winters. Its winters are projected to keep warming through 2050.
Out of range today and still out of range 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.
Loading AHS heat-zone data for this location...

Where this plant fits

Suitable across 4 ecoregions - 3 climate-resilient through 2070 · 1 newly possible by 2070. Best matches first.

Plant this, not that

Better fit for this place
For Chicago, IL, these are replacement suggestions: similar plants with a stronger hardiness fit now and/or in 2050.

Similar plants

Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.
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American elderberry
A fast, suckering native shrub of streambanks and moist thickets across eastern North America, grown for huge flat-topped cymes of tiny lemon-scented white flowers in early summer and the clusters of dark elderberry drupes that follow. Spreads by root suckers into naturalized colonies 5 to 12 feet tall and wide; the flowers feed butterflies and the showy fruit feeds birds. The raw berries are not eaten fresh - they are cooked into jelly, pie, and wine.
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Protea neriifolia
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Protea neriifolia, the bearded protea, is a tall, robust evergreen fynbos shrub from the Cape Floristic Region of South Africa, grown for its large goblet-shaped flower heads of soft pink-to-cream bracts - each one rimmed with a distinctive 'beard' of black or white fur at the bract tips. Narrow, oleander-like leaves clothe the stems, and the long-lasting blooms are a staple of the cut-flower trade. It is one of the easiest, longest-flowering, and most widely grown proteas, but it is FROST-TENDER (RHS H3, hardy to only about 25°F briefly) and belongs in a warm-temperate or Mediterranean climate, USDA zones 9a-11, or under glass. Like all of its family it is PHOSPHORUS-SENSITIVE: ordinary phosphate fertiliser or bone meal will kill it, and it demands acidic, sharply-drained soil, full sun, and good air circulation. In its homeland the nectar-rich heads are bird-pollinated by sunbirds and sugarbirds.
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Pollinator
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Border
Focal point
Pollinator
Structure
Container
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Doublefile viburnum is a deciduous shrub native to China, Korea, Japan, and Taiwan, grown for its spectacular tiered, horizontal branching draped in flat lacecap flower heads in late spring. It earns its place as a four-season focal point - white flowers in May, blue-black drupes in late summer, and often vivid red-purple autumn colour - but the honest catch is its sheer footprint: mature plants can spread 13 to 16 feet wide with rigidly horizontal branches that resent hard pruning, and the fruit is not edible.
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Focal point
Structure
Border
Pollinator
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Shrub
Full sun / Part shade
Moderate water
Zones 6a-9a
Climate: narrow
Border
Focal point
Pollinator
Structure

Educator packet

Plant packet
King protea educator packet
A sculptural evergreen fynbos shrub bearing the largest flower head of any protea - a great goblet of pointed pink bracts wrapped around a dense central boss - and the national flower of South Africa. Leathery, rounded leaves clothe a woody, fire-adapted rootstock. It is native to the Cape Provinces of South Africa, the Cape Floristic Region / fynbos (POWO, Kew), and is FROST-TENDER: RHS rates it tender (H3), hardy only to about 25°F briefly, so outside warm-temperate / Mediterranean climates it is grown under glass or in a sheltered, sharply-drained spot. Like all Proteaceae it is PHOSPHORUS-SENSITIVE - it evolved on nutrient-poor fynbos soils with cluster (proteoid) roots, and ordinary phosphate fertiliser or BONE MEAL will kill it. In the wild the nectar-rich heads are bird-pollinated, worked by sunbirds and sugarbirds. Grown ornamentally and as a premier cut flower; it is not a food plant.
Scientific name
Protea cynaroides
Plant type
shrub
Hardiness
9a-11
Light
full-sun
Moisture
low
Spacing
60 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). King protea (Protea cynaroides). Retrieved 2026, August 20, from https://plotwright.com/plants/protea-cynaroides
Sources used for this record
This record is compiled from the sources below.
Plants of the World Online (POWO)
Botanical research database
RHS Find a Plant
Botanical research database
GBIF
Botanical research database
Wikipedia (ecoregion articles)
Botanical research database
Wikimedia Commons
Photo