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
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
Landscape groups by tags
See other plant types of Centaurea for your garden
aka Cornflower
Plant Type
Perennial
Zones
6a-10b
Size
Height: 24"
Width: 12"
- sun
- occasional - drought tolerant
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
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
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
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
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