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botanical name:
Centaurea glastifolia
Centaurea glastifolia © Deeproot Plant Base    view larger image
common name:  Knapweed, Woad-leaved Centaurea
synonyms:  Chartolepis glastifolia
family:  Asteraceae
characteristics: perennial
height: 1.50m
width: 0.60m
growth rate: medium
growth habit: clump
leaf colour: green
flower colour: yellow
fruit colour: brown
stem/bark: green
main season: Summer
aspect: full sun
conditions: moist soil
preferred soil pH: neutral-alkaline
minimum temp: -29°C
USDA zone: 5 to 8
Tall, clump forming perennial. Elliptic to lanceolate mid-green leaves on erect stems. Large bright yellow flowerheads with white, papery involucral bracts.

By seed or division.

other notes:
From Eastern Europe, Turkey and Central Asia to Siberia.
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