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Buy Delphinium Black Knight (Delphinium) online from Jacksons Nurseries
Buy Delphinium Black Knight (Delphinium) online from Jacksons NurseriesBuy Delphinium Black Knight (Delphinium) online from Jacksons Nurseries

Delphinium 'Black Knight' (2L)

Delphinium

£5.99

One of the classic flowers of the traditional summer garden, this is a stunning, ornamental variety producing tall, upright spires laden with intensely-coloured, majestic, deep violet-blue blooms from June to July. It forms a mound of gorgeous, deeply-cut, grey-green leaves and looks beautiful when planted in bold groups at the back of a mixed or herbaceous border. Although the flowering season is relatively short, cutting back summer flowering stems as soon as the blooms are over will help to encourage a second flush of colour over the autumn.

Perfect for adding height and a bold splash of colour to the cottage garden, it also combines well with creamy-white flowering perennials and makes a great choice for high altitude gardens. Young foliage benefits from being protected from slug damage in the spring and slender stems should be staked before the flowers appear.

Buying Perennials from Jacksons Nurseries

At Jacksons Nurseries we lightly trim back our perennials after flowering to ensure that the plants remain neat and tidy whilst in the pot. The more tender the plant the less we cut back to help protect exposed stems from winter frost. Depending on the plant variety we will then prune back further in spring once the risk of the more severe frosts is over.

As a result, depending on the time of year you buy perennials, they may not look like images showing their ‘prime time’ in flower and looking at their best.

From late autumn onwards and dependant on variety, there may be very little visible above the soil except for a few cut back dormant leaves or stems. It is perfectly normal for dormant plants to look like this from autumn onwards, they will however burst back into life in spring.

Please Note: Pre-order delivery dates are given as a guide only and may vary dependent on the growing season.

Orders containing Pre-Ordered products will be shipped as a single order when all items become available. Large orders may be part shipped, please contact us on 01782 502741 or email orders@jacksonsnurseries.co.uk.

Delphinium 'Black Knight' (2L)

One of the classic flowers of the traditional summer garden, this is a stunning, ornamental variety producing tall, upright spires laden with intensely-coloured, majestic, deep violet-blue blooms from June to July. It forms a mound of gorgeous, deeply-cut, grey-green leaves and looks beautiful when planted in bold groups at the back of a mixed or herbaceous border. Although the flowering season is relatively short, cutting back summer flowering stems as soon as the blooms are over will help to encourage a second flush of colour over the autumn.

Perfect for adding height and a bold splash of colour to the cottage garden, it also combines well with creamy-white flowering perennials and makes a great choice for high altitude gardens. Young foliage benefits from being protected from slug damage in the spring and slender stems should be staked before the flowers appear.

 


 

Delphinium Black Knight
Delphinium
Perennials
1.5m - 2m
0.5m - 1m
  • Blue
  • Purple
Summer
Deciduous
No
Average
Fully Hardy
  • Full sun  Full sun
  • Moist Well-drained
  • Well-drained
  • Acid
  • Neutral
  • Alkaline
  • Chalk
  • Loam
  • Sand

Perennials are described and classified differently by different gardeners but all would agree that they are plants that come into flower every year from early spring to late summer, the exact time dependent on variety and most die back to ground level in autumn and winter.

As for all plants, soil preparation is time well spent. Dig over the area to be planted ensuring that the ground is free draining. If not then you may wish to either consider planting in a different spot or raising the level of the planting area by adding additional topsoil, well rotted garden compost and/or well rotted manure. Add ‘Fish, Blood and Bone’ fertiliser or a high potash fertiliser to encourage good root growth and development.

It’s always a good idea to plant a few of the same plant together, we recommend planting in 3’s or 5’s to provide a bold effect but allowing them plenty of room to develop.

Always check eventual plant heights when planning borders to ensure that the taller plants are at the back (or at the centre of an island bed) followed by the medium and then smaller low growing plants.

Remember to deadhead perennials after flowering, trim back lightly in autumn as required to tidy the border and if necessary trim again in spring once the risk of heavy frost has passed.

If perennials get too big, start to flower less and less or if it seems to be dying off from the centre, consider dividing the plant but always check that the particular variety is happy to be divided and that you divide at the right time of year for the plant.

By using this simple guide and a little time, perennials can make an absolutely spectacular difference to your garden.

Westland Gro-Sure All Purpose Plant Food

CODE: 6185

In stock
£3.99

Great all round feed for plants, vegetables and flowers in gardens and inside the home. Packed with nutrients for healthy flowers... More 

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Westland Fish, Blood and Bone

CODE: 6193

In stock
£14.99

Ready to use Helps build soil fertility Encourages strong, healthy growth Increases crop yield Nutrient Content... More 

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Westland Bonemeal Root Builder

CODE: 6194

OUT OF STOCK
Out-of-stock
£3.99

Westland Bonemeal is a natural, slow release, organic plant food that is ideal for trees and shrubs. It promotes strong and healthy rooting as well as... More 

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Westland Water Saving Gel 250g

CODE: 6184

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£4.99

This specially formulated water-retaining gel that has the capacity to hold 400 times its own weight in water. This water is absorbed and released... More 

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Aquilegia vulgaris var. stellata 'Blue Barlow' (2L)

CODE: 531

In stock
£5.99

Tall, upright perennial with fern-like grey/green leaves and violet-blue pompon-like fully double flowers. Looks very striking when planted amongst... More 

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Aconitum carmichaelii 'Arendsii' (2L)

CODE: 416

OUT OF STOCK
Out-of-stock
£5.99

Branched panicles of large, masculine, purple-blue hooded flowers are produced on beautiful, slender stems from July to August. A very productive, tall... More 

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Tricyrtis hirta 'Empress' (2L)

CODE: 618

In stock
£6.99

Tricyrtis hirta 'Empress' is a dwarf variety of Tricyrtis hirta. This unique perennial is perfect for adding a touch of the exotic to any shady... More 

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Delphinium 'Blue Bird' (2L)

CODE: 436

In stock
£5.99

Majestic, tall, upright flowering spikes laden with spectacular, vibrant, mid-blue blooms from June to July. This is an elegant, Pacific hybrid with an... More 

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Iris Ensata syn kaempferi (2L)

CODE: 473

In stock
£5.99

Beautiful Iris with white, violet, crimson, yellow butterfly-like flowers, many have bold markings. Each stem produces single, double, or... More 

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Achillea 'Terracotta' (2L)

CODE: 415

In stock
£5.99

An abundance of large terracotta flowers contrast beautifully over ferny foliage that lasts well, and fades to yellow in autumn.  The attractive... More 

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Astrantia major 'Ruby Wedding' (2L)

CODE: 536

In stock
£6.99

Beautifully delicate pincushion flowers of deep ruby-red adorn this pretty perennial throughout the summer months. Pretty mid-green leaves add to the... More 

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Anemone x hybrida 'Konigin Charlotte' (2L)

CODE: 420

In stock
£5.99

Masses of large, semi-double, bowl-shaped, rich pink blooms with slightly ruffled petals and a bright golden-yellow centre are produced repeatedly from... More 

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Achillea filipendulina 'Cloth of Gold' (2L)

CODE: 413

In stock
£5.99

Large bright golden yellow flowers, delicate fern like foliage. Ideal for the back of an herbaceous border. Prefers full sun in a border and keep... More 

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Astrantia major 'Claret' (2L)

CODE: 427

In stock
£7.99

Branched clusters of stunning, intensely-coloured, ruby-red flowers with pincushion-like centres and a flush of pure white at the base of each petal are... More 

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Add a Card and Message to your order

CODE: 12640

In stock
£1.50

Are you buying a gift for a loved one? If so, then why not add a personal message to your purchase. Simply enter your message in the box above and... More 

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