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.
Better fit now and in 2050
Now: well-suited
2050: well-suited
Better fit now and in 2050
Now: well-suited
2050: well-suited
Better fit now and in 2050
Now: well-suited
2050: well-suited
Better fit now and in 2050
Now: well-suited
2050: well-suited
Similar plants
Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.
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.








