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Centaurea Nigra | Common Knapweed

20% off selected

Centaurea Nigra | Common Knapweed

Centaurea Nigra | Common Knapweed

£7.99 £6.39
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Ideal for naturalising in a sunny wildflower garden, this delightful knapweed produces masses of reddish-purple flowers from midsummer. Often found growing...

9cm pot
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Plant description

Ideal for naturalising in a sunny wildflower garden, this delightful knapweed produces masses of reddish-purple flowers from midsummer. Often found growing cliff-tops and along roadsides, the thistle-like flowers are a magnet for butterflies and bees.
Position

Position

Full sun

Rate of growth

Rate of growth

Fast-growing

Flowering period

Flowering period

July - September

Soil type

Soil type

All soil types

Hardiness

Hardiness

Fully hardy

Eventual height & spread
Eventual height and spread

Specifications

Delivery Option
Standard delivery
Location
Outdoor
Soil type
All soil types
Rate of growth
Average
Hardiness
Fully hardy
Flower colour
Purple
Dimensions
9cm pot
Product Code
RH30004133

Care guide

Surface-sow seeds in trays filled with good quality compost, water and place in a cold frame or greenhouse. Pot on when they have put on their first true leaves and harden off before planting out after the frosts have passed. Alternatively sow directly in late spring or early summer, and thin out to 30cm as they grow. Wildflowers prefer poorer soils, so do not use a fertiliser. Deadhead regularly to prolong flowering. In autumn cut the faded flower-heads down to the ground and compost the dead stems. Seeds sown in autumn and over-wintered in a cold frame will produce plants that will flower earlier in the year than those sown in spring. Sow: September - November or March - May Approximate quantity: 20 seeds

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