Popular 21 others are looking at this right now

Centaurea nigraCommon Knapweed, Wildflower, Perennial Cornflower

Hardy Perennial

What is Hardy Perennial?
A plant that lives for more than two years.
Capable of withstanding outdoor winter temperatures down to -15C.

£19.99

Small bright purple flowers

Flowers from July to September

Loved by pollinators

Loading...
Garden Club Members Price: £17.99 JOIN TODAY

Frequently bought with

Select to add to basket


Height Up to 75cm (30in)
Spread Up to 50cm (20in)

Hardy Perennial

cottage gardenswildlife gardenslow maintenance garden

full sun

JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
Flowering Months

You May Also Like

Penstemon Czar'

Penstemon Czar'

1 Review

Just£8.69 (was £9.29)

ADD TO BASKET
Achillea millefolium 'Cerise Queen'

Achillea millefolium 'Cerise Queen'

12 Reviews

11 Options From£4.99 (was £6.99)

ADD TO BASKET
Foxglove 'Excelsior Hybrids'

Foxglove 'Excelsior Hybrids'

36 Reviews

4 Options From£16.99

ADD TO BASKET
Eryngium planum 'Blue Hobbit'

Eryngium planum 'Blue Hobbit'

22 Reviews

8 Options From£14.99

ADD TO BASKET
Delphinium 'Magic Fountains Mixed'

Delphinium 'Magic Fountains Mixed'

71 Reviews

4 Options From£15.99

ADD TO BASKET
Achillea millefolium 'Summer Berries'

Achillea millefolium 'Summer Berries'

34 Reviews

4 Options From£14.99

ADD TO BASKET
Coreopsis 'Golden Joy'

Coreopsis 'Golden Joy'

109 Reviews

13 Options From£4.99 (was £7.19)

ADD TO BASKET
Amber Shades Basket

Amber Shades Basket

2 Reviews

2 Options From£16.99 (was £22.99)

ADD TO BASKET
Coral Falls Basket

Coral Falls Basket

1 Review

2 Options From£16.99 (was £22.99)

ADD TO BASKET
Geranium 'Jackpot Mixed' F1 Hybrid

Geranium 'Jackpot Mixed' F1 Hybrid

1370 Reviews

8 Options From£5.99

ADD TO BASKET
Petunia 'Frills & Spills'™ Mixed' Pre-Planted Basket

Petunia 'Frills & Spills'™ Mixed' Pre-Planted Basket

81 Reviews

3 Options From£22.99

ADD TO BASKET
Foxglove 'Dalmatian Mixed'

Foxglove 'Dalmatian Mixed'

112 Reviews

6 Options From£4.99 (was £8.99)

ADD TO BASKET
Description
Knapweed makes a fabulous low-maintenance perennial, happy even in poor soils and hardy from one end of the UK to the other! This British wildflower will light up your garden borders with its glowing pink-purple blooms from June to September and is particularly attractive to butterflies. Common knapweed is a fabulous addition to informal borders, cottage gardens and wildlife gardens. Height: 75cm (30"). Spread: 50cm (20").

Show Codes

1 x 1 Litre Potted Plant (KA4920)

How to Grow
Plant in a position with full sun. Knapweed is drought tolerant once established and will happily tolerate almost any soil, except those that are excessively waterlogged.
More Info
Water knapweed plants regularly until fully established. This plant will self-seed freely. If seedlings are not wanted, deadhead stems of knapweed flowers as the blooms fade. In autumn, cut back old stems to just above ground level to make way for new growth in the spring.
Delivery

Seeds and garden supplies will normally be delivered within the time period stated against each product as detailed above. Plants, bulbs, corms, tubers, shrubs, trees, potatoes, etc. are delivered at the appropriate time for planting or potting on. Delivery times will be stated on the product page above, or in your order acknowledgement page and email.

Orders for packets of seed incur a delivery charge of £2.99.

Orders which include any other products will incur a delivery charge of £6.99.

Where an order includes both packets of seeds and other products, a maximum delivery charge of £7.99 will apply - regardless of the number of items ordered.

Large items may incur a higher delivery charge - this will be displayed in your shopping basket.

Please see our Delivery page for further details, and more information on different charges that may apply to certain destinations.

For more information on how we send your plants please visit our Helpful Guide on plant sizes.

Recently Viewed

Centaurea nigra

Centaurea nigra

0 Reviews

Just£19.99

ADD TO BASKET

Sign Up For Exclusive Special Offers

JOIN NOW
RedEye

Sign up for exclusive offers!