silver knapweed
Centaurea ragusina
USDA zones8 to 11
SunNeeds full sun (6+ hours)
WaterNeeds dry soil
Size12 to 24 inches tall2 to 3 feet wide
- Bloom season
- Spring, summer, autumn, winter
- Soil types
- Sand, loam, clay, chalk
- Soil pH
- Acid, alkaline, neutral
Garden uses
Notes
Silver knapweed (Centaurea ragusina) is a perennial for borders, containers, and low maintenance gardens. It is hardy to USDA zone 8, or down to 10°F (-12°C). This plant likes full sun and dry soil of most types. It forms a mound of silver evergreen foliage that stays 12 to 24 inches tall and spreads 24 to 36 inches wide. It is drought tolerant and salt tolerant, so it suits tough spots.
Pairs well with Sea holly, Elfin mother of thyme, and Meadow sage.