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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

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