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Centaurea ragusina | Silver Knapweed

ePlant Details

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Synonym Names: Centaurea candidissima

Family: Asteraceae

Location:

Centaurea ragusina is a relatively short-lived perennial, with decumbent stems producing a number of rosettes of the striking, grey-white, pinnately lobed leaves which earn it its common name of Dusty Miller. The scale of the plant is approximately 12-18in (30-45cm) tall and up to 24in (60cm) wide in age. Cuttings come relatively easily and it is therefore simple to replace when the parent plant 'wears out'. It will be longer lived and handsomely compact if grown dry or minimally irrigated in a poor, stony, well-drained soil or on walls. The fat, thistle-like, bright yellow flowers are quite beautiful and are shown off well against the grey foliage. Unlike the Jacobaea mentioned above, flowering does not unduly ruin the plant's form - it actually enhances it. The unique character of this plant can still find a role in Mediterranean gardens.

Anatomy

Plant Type

Perennial

Height Range

1-3'

Width Range

1-3'

Flower Color

Purple, Yellow

Flower Season

Summer

Leaf Color

Silver, White

Bark Color

n/a

Fruit Color

n/a

Fruit Season

n/a

Culture

Sun

Full, Half

Water

Low

Growth Rate

Fast, Moderate

Soil Type

Sandy, Loam

Soil Condition

Average, Well-drained, Dry

Soil pH

Neutral

Adverse Factors

Attracts Bees

USDA Zones

4, 5, 6, 7, 8, 9, 10

Sunset Zones

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24

Susceptibilities

n/a

Tolerances

Windy Conditions, Deer

Design

Design Styles

English Cottage, Formal, Mediterranean, Spanish

Accenting Features

Unusual Foliage

Seasonal Interest

Summer

Location Uses

Entry, Perennial Border, Patio, Raised Planter, Swimming Pool, Walkways, With Rocks

Special Uses

Filler, Small Spaces

Attracts Wildlife

Pollinators

Information by: Jerry Sortomme Editor

Photography by: Jackie Seidman

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