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Home>Flowers, Plants & Shrubs>Plants>Border Perennials>Perennial & Biennial Plants


Centaurea nigraCommon Knapweed, Wildflower

Just £8.99

Hardy Perennial
What is Hardy Perennial?
A plant that lives for more than two years.
Capable of withstanding outdoor winter temperatures down to -15C.
3 centaurea Postiplug plants £8.99 Out of Stock
Description How to Grow More Info Delivery
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").

Cottage Gardens, Wildlife Gardens, Low Maintenance Garden

Hardy

Full sun

Up to 75cm (29.5in)

Up to 50cm (19.7in)

Easy for all

Easy for all

Thompson & Morgan strives to ensure that all its plants are delivered to you in the perfect condition for planting. Sadly, the time it takes to deliver to certain locations in the UK means that we can't guarantee this, so regretfully we are unable to ship live plants to the following areas: GY, HS, IV41-IV56, KW15-KW17, PA34, PA41-48, PA60-PA78, PA80, PH40-PH44, TR21-TR24, ZE1-ZE3.

3 Centaurea Postiplug Plants (T17604)

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Flowering Months
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.
Pot up Knapweed plants and grow them on in frost free conditions for transplanting outdoors later on. When plants are well-grown and all risk of frost has passed, acclimatise them to outdoor conditions over a period of 7 to 10 days, before planting them in borders in full sun. Knapweed is drought tolerant once established and will happily tolerate almost any soil, except those that are excessively waterlogged.

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 and will be stated on the product page or in your order acknowledgement page and email.

Orders for packets of seed incur a delivery charge of £1.95.

Orders which include any other products will incur a delivery charge of £4.95.

Where an order includes both packets of seeds and other products, a maximum delivery charge of £6.90 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 details of any surcharges that may apply to certain destinations.

Satisfaction Guaranteed

For your complete peace of mind, our Home and Garden products may be returned to us within 30 days of purchase for a refund of the purchase price. Items must be returned unused, at your cost and in mint condition. All items carry a manufacturer's 12 month defects warranty.

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