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    Centaurea nigra subsp. rivularis

    Also Known As

    • Rivularis Cornflower
    • Rivularis Knapweed

    Plant type

    perennial

    size

    • H: 1'-2'
    • W: 1'-2'

    planting zones

    • 5a-10a

    Centaurea nigra subsp. rivularis plant details

    Centaurea nigra subsp. rivularis is a broadleaf deciduous perennial with green foliage. In summer purple flowers emerge. Attracts butterflies making it an excellent addition to pollinator gardens. Grows well with sun and even moisture - occasional water. Does well in clay and gritty soil.

    CHARACTERISTICS OF Centaurea nigra subsp. rivularis

    Plant type: perennial
    Plant family: asteraceae
    Foliage: deciduous green
    Mature size: 1 FT - 2 FT - wide, 1 FT - 2 FT - tall
    Flowers: purple blooms in summer
    Uses: cutting garden, dwarf

    GROWING CONDITIONS for Centaurea nigra subsp. rivularis

    USDA Zones: 5a - 10a
    Sun exposure: sun
    Watering frequency: even moisture - occasional
    Soil needs: clay and gritty

    Nursery contributed plant descriptions

    A dwarfer (1-2') & more refined Knapweed with dark-purple flower resembling a "large, gaudy button"; also called Hardheads because "the unopened fl buds are quite extraordinarily hard." (Pizzeti). SUN/Med-Dry

    By: Forestfarm

    Gardening facts about Centaurea nigra subsp. rivularis plant

    How to Grow Centaurea nigra subsp. rivularis

    • Sun Exposure

      • sun

    • Water Needs

      • even moisture - occasional

    • Soil Needs

      • clay
      • gritty

    Features

    • Foliage Color

      • green

    • Flower Color

      • purple

    • Wildlife

      • butterflies

    • Flower Season

      • summer

    • Foliage Season

      • deciduous

    See other plant types of Centaurea for your garden

    Centaurea orientalis

    aka Cornflower

    Plant Type

    Perennial

    Zones

    6a-10b

    Size

    Height: 24"

    Width: 12"

    • sun
    • occasional - drought tolerant
    Photo of Centaurea orientalis flower by Dancing Oaks Nursery
    View Plant

    Centaurea cyanus 'Black Gem'

    aka Cyanus segetum 'Black Gem', Black Gem Bachelor's Buttons

    Plant Type

    Annual / Biennial

    Zones

    1-11

    Size

    Height: 12"-24"

    Width: 6"-12"

    • sun
    • regular - drought tolerant
    • dry in summer
    Photo of Centaurea cyanus 'Black Gem' flower, form by Annie's Annuals & Perennials
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    Centaurea cyanus 'Blue Diadem'

    aka Cyanus segetum 'Blue Diadem', Blue Diadem Bachelor's Buttons

    Plant Type

    Annual / Biennial

    Zones

    1-11

    Size

    Height: 24"-36"

    Width: 12"-30"

    • sun - mostly sun
    • occasional - drought tolerant
    • dry in summer
    Photo of Centaurea cyanus 'Blue Diadem' flower by Annie's Annuals & Perennials
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    Centaurea scabiosa

    aka Centaurea scabiosa 'Perennial Butterfly', Greater Knapweed, Perennial Bachelor Button, Perennial Butterfly Cornflower

    Plant Type

    Perennial

    Zones

    3a-10b

    Size

    Height: 2'

    Width: 3'

    • sun - mostly sun
    • regular - occasional
    Photo of Centaurea scabiosa flower by Annie's Annuals & Perennials
    View Plant

    Centaurea cineraria

    aka Centaurea candidissima, Centaurea gymnocarpa, Dusty Miller, Velvet Centaurea, Velvet Centaurea

    Plant Type

    Shrub, Perennial

    Zones

    7a-10b

    Size

    Height: 3'-4'

    Width: 8'

    • sun - mostly sun
    • regular - drought tolerant
    • dry in summer
    Photo of Centaurea cineraria flower, foliage by Annie's Annuals & Perennials
    View Plant

    More Options

    +38 more Centaurea
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