Alphabetical Plant Listing

Centaurea ragusina (Silver Knapweed)

Silver Knapweed, Ragusa Knapweed, Dubrovnik Cornflower, Snowflake Dusty Miller, Centaurea clementei


Noted for its ravishing foliage, Centaurea ragusina (Silver Knapweed) is a relatively short-lived evergreen perennial forming decorative rosettes of soft, velvety, silver-white leaves, 6 in. long (15 cm). The rosettes of pinnately lobed leaves are reminiscent of snowflakes, hence the Snowflake Dusty Miller common name. From late spring through mid-summer, fat, thistle-like, bright yellow flowers, up to 2 in. wide (5 cm), rise cheerfully atop solitary to few branched stems. Quite beautiful, they stand out against the silver foliage. Native to Croatia where grows on cliffs, rocks and stone walls on the islands and mainland of the central and southern Dalmatian coast, Silver Knapweed is a very attractive foliage plant for use in Mediterranean gardens and containers.

  • Grows up to 12-24 in. tall (30-60 cm) and 24-36 in. wide (60-90 cm).
  • Performs best in full sun in dry or minimally irrigated, poor, stony, well-drained soils. Drought tolerant once established. Tolerant of wind, salt spray and seashore conditions
  • Perfect for beds and borders, cottage gardens, coastal gardens, rock gardens . Excellent choice for containers.
  • Easy to grow and virtually pest and disease free. Keep an eye out for powdery mildew, aphids.
  • Propagated by cuttings.
  • Native to Croatia.

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Requirements

Hardiness 8 – 11
Plant Type Perennials
Plant Family Centaurea - Cornflowers
Exposure Full Sun
Season of Interest Spring (Early,Mid,Late)
Summer (Early,Mid,Late)
Fall
Winter
Height 1' – 2' (30cm – 60cm)
Spread 2' – 3' (60cm – 90cm)
Spacing 24" – 30" (60cm – 75cm)
Water Needs Low
Maintenance Low
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Showy, Evergreen
Tolerance Drought, Dry Soil, Salt
Garden Uses Beds and Borders, Patio and Containers
Garden Styles Coastal Garden, Gravel and Rock Garden, Informal and Cottage

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Guides with Centaurea - Cornflowers


c) Gerhard Bock, SucculentsandMore.com, Seán A. O'Hara, Megan Hansen, Olivier Bruchez, Flickr

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 8 – 11
Plant Type Perennials
Plant Family Centaurea - Cornflowers
Exposure Full Sun
Season of Interest Spring (Early,Mid,Late)
Summer (Early,Mid,Late)
Fall
Winter
Height 1' – 2' (30cm – 60cm)
Spread 2' – 3' (60cm – 90cm)
Spacing 24" – 30" (60cm – 75cm)
Water Needs Low
Maintenance Low
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Showy, Evergreen
Tolerance Drought, Dry Soil, Salt
Garden Uses Beds and Borders, Patio and Containers
Garden Styles Coastal Garden, Gravel and Rock Garden, Informal and Cottage

Great Plant Combination Ideas with Centaurea - Cornflowers

Guides with Centaurea - Cornflowers

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