Great Masterwort
Astrantia major
Great masterwort is a clump-forming herbaceous perennial native to the mountain meadows, grasslands, and forest clearings of central and southern Europe (the Pyrenees, Carpathians, and Balkans) and east through the Caucasus to Anatolia (Wikipedia). Its distinctive pincushion flowerheads - a dome of tiny florets ringed by papery star-shaped bracts - bloom from June through September in white, pink, and deep red tones, making it a long-season cottage-garden favorite. It performs beautifully in cool, evenly moist sites with partial shade. The honest catch: Astrantia is a cool-climate specialist that sulks badly in hot, humid summers - in zones 7b and warmer with heat-laden summers it loses vigor, fades early, and is prone to powdery mildew; consistent moisture is non-negotiable and drought even for a week can trigger early summer dormancy.
Climate fit: narrow (30/100)
Border
Pollinator
Filler
Light
Part sun / Part shade
Water
Consistent moisture
Mature size
2-3 ft tall · 18" apart
Hardy in zones
4a-7b
very cold to cold winters
Native in Illinois
No
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Entomophilous: mainly pollinated by beetles but also by flies, bees, and other insects (Wikipedia).
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
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 32 ecoregions - 24 climate-resilient through 2070 · 5 suited today · 3 newly possible by 2070. Best matches first.
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
Great Masterwort educator packet
Great masterwort is a clump-forming herbaceous perennial native to the mountain meadows, grasslands, and forest clearings of central and southern Europe (the Pyrenees, Carpathians, and Balkans) and east through the Caucasus to Anatolia (Wikipedia). Its distinctive pincushion flowerheads - a dome of tiny florets ringed by papery star-shaped bracts - bloom from June through September in white, pink, and deep red tones, making it a long-season cottage-garden favorite. It performs beautifully in cool, evenly moist sites with partial shade. The honest catch: Astrantia is a cool-climate specialist that sulks badly in hot, humid summers - in zones 7b and warmer with heat-laden summers it loses vigor, fades early, and is prone to powdery mildew; consistent moisture is non-negotiable and drought even for a week can trigger early summer dormancy.
Scientific name
Astrantia major
Plant type
perennial
Hardiness
4a-7b
Light
part-sun, part-shade
Moisture
consistent
Spacing
18 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). Great Masterwort (Astrantia major). Retrieved 2026, August 20, from https://plotwright.com/plants/astrantia-major
Sources used for this record
This record is compiled from the sources below.





