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Home>Flower bulbs, plants and seeds>Flower Plants>Cottage Garden Plants

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Centaurea nigra

Common Knapweed, Wildflower, Perennial Cornflower

Hardy Perennial

£19.99

Small bright purple flowers

Flowers from July to September

Loved by pollinators

Delivery Information View Product Description

Please note: This product cannot be delivered outside the United Kingdom.

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").

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

Hardiness & Longevity Hardy Perennial

Ideal For cottage gardenswildlife gardenslow maintenance garden

Position In full sun

Flowering Months

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Codes
1 x 1 Litre Potted Plant (KA4920)

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.

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.

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.