Wildflowers UK, bringing the British Countryside to you.

Your basket is empty

BLACK KNAPWEED plugs (centaurea nigra)

BLACK KNAPWEED plugs (centaurea nigra)
mouse over thumbnails for large image
BLACK KNAPWEED plugs (centaurea nigra)BLACK KNAPWEED plugs (centaurea nigra)
BLACK KNAPWEED plugs (centaurea nigra)BLACK KNAPWEED plugs (centaurea nigra)
BLACK KNAPWEED plugs (centaurea nigra)BLACK KNAPWEED plugs (centaurea nigra)
BLACK KNAPWEED plugs (centaurea nigra)BLACK KNAPWEED plugs (centaurea nigra)

BLACK KNAPWEED plugs (centaurea nigra)

  Our ref: IP4_1
type - perennial
  • wildflower plant plugs
  • colour - Purple
  • RHS perfect for pollinators
  • Dispatched May-September
  • Plant at approx 1-4 plugs per sq. m
enquire about this item
minus0plus 10 plugs = £14.95

 Add to basketplease use minus and plus to select a quantityplease select a quantity added to basket

Recommended planting density 1-4 plugs per sq. meter. If you require 200 or more plugs in total, special pricing may be available, please contact us or call 01452 311525 for a quotation. Plugs are available for dispatch May to September when at their best and more receptive to outdoor planting.

RHS perfect for pollinators
Perfect for pollinators

RHS Perfect for Pollinators.
The RHS Perfect for Pollinators mark is only given to plants that support pollinating insects
in gardens. Bees, butterflies, moths, hoverflies and many others visit flowers to feed on
nectar and pollen; while doing so they transfer pollen and increase seed set
and fruit development. Find out more at: rhs.org.uk/plants

To discover further wildflowers for Bees and other insects, simply enter the word "pollinators" into the search box above.

Centaurea nigra – Black Knapweed also known as Common Knapweed or Lesser Knapweed. In our experience Black Knapweed is one of the most competitive of all wildflowers and for that reason is perfect for introducing into fertile soils where it will often compete and grow well amongst tussocky grass. It also grows well on open ground and is well suited to clay and loam soils where there is plenty of sunlight.
Black Knapweed is a tall plant with a mauve flower that appears from June to September. Plants harbour a wide range of insect life such as Bees, Butterflies and Ladybirds and are often visited by birds such as goldfinches in search of the seeds.

Black Knapweed looks best growing with other summer flowering plants such as Oxeye daisies, Musk Mallow, Meadow Cranesbill and Field Scabious.

How to grow Black Knapweed plants:

Black Knapweed plug plants can be introduced to their permanent planting positions from late spring through to October. Initially they should be kept well watered and left to develop for several months. When planting into established grass it is advisable to first cut the areas where the wildflower plants are to be introduced and create a small bare area up to several inches around each planting position to reduce initial competition. Given the right conditions they will develop quickly into flowering sized plants. Bear in mind that Black Knapweed plants go partially dormant in autumn, shedding it’s foliage which will reappear the following spring. A few Yellow rattle seeds sown around each plug may also be of benefit in the long term by reducing competition from grasses.


type - perennial, colour - Purple, height - 25 to 50cms, flowers June, July, August, September, habitat - Moist Grassland (Clay, Loams), Dry Grassland (clay, loam), Very dry Sandy Soil, Very Acidic Soil (Peats, Heaths), Attracts Birds and butterflies,

Printed 20/08/2019 09:07:48
ip4_1 type perennial colour purple height 25 to 50cms flowers june july august september habitat moist grassland clay loams dry grassland clay loam very dry sandy soil very acidic soil peats heaths attracts birds and butterflies rhs perfect for pollinators pollinating insects bees butterflies moths hoverflies
£14.95 New


Wildflowers UK, Supplier of Native British Wildflower meadow mixtures, Wildflower seeds, Urban mixtures, Wildflower plant plugs & bulbs to commercial & private buyers