Buy Buddleja davidii 'Black Knight' (Butterfly Bush (Buddleja)) online from Jacksons Nurseries

Buddleja davidii 'Black Knight' (2-3L)

Butterfly Bush

2-3 Litre Pot Size Guide
39 item(s)

At a Glance

The "Black Knight" variety is very rare in Britain despite its excellent characteristics. It is the darkest of the purple forms of Buddleia (also known as Butterfly bush due to their attraction to it) and shows long trusses of deep violet.

This is a large deciduous shrub that produces large arching canes and often grows to its maximum height of 3 metres. The long, narrow foliage is grey-green to green above and white and fuzzy on the underside. Bears long, upright showy flowers which are lilac and orange in the throat. These are followed by small-capsules of fruit which help to give the plant year round colour and interest.

Should be grown in a fertile soil where full sun is available. Also benefits from being pruned back in spring to encourage new growth.

Buying Shrubs from Jacksons Nurseries

At Jacksons Nurseries we sell a variety of shrubs both evergreen and deciduous with a variety of flowering times throughout the year. At certain times of the year our shrubs you buy from us may not look like the images shown on our website when deciduous leaves have fallen, the shrub has finished flowering or has been trimmed back.

Some leaves on evergreen shrubs can be damaged in winter by frost or harsh winds but in spring new leaves will readily replace those damaged. This is quite normal on many evergreen varieties and is preferable to plants grown with excessive protection that show cold shock once planted out and establish less satisfactory initially.

Availability: Stock availability figures are provided as a guide only. There is a delay between orders being placed and the plants being gathered by our pulling team. During this time it may be possible for a member of the public to purchase these plants from our Garden Centre, while this is rare it is a possibility and we will notify you of any problems as soon as possible. This figure may also include plants that have not yet be flagged as unsaleable.

Pre-order: Pre-order times 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

Shrubs are deciduous or evergreen woody plants, and often provide fragrant flowers, berries and foliage. They are good for structural framework, and they can provide a wonderful shelter and food source for wildlife.

Planting and Conditions

Container grown shrubs can be grown at any time of year. It is a little known fact that shrubs planted in the autumn and winter will be easier to look after than those planted in the spring and summer, because they will have time to establish and become hardy in the cooler months.

Plant the shrub at the same depth as it was in its original pot. Planting too deeply can result in root and stem rot.

One of the biggest causes of death in new shrubs is drought stress, so keep it well watered until it’s established.

Make sure you loosen the soil prior to planting. Most shrubs are tolerant of most soil types as long as it is fairly well draining.

Most shrubs will grow happily in containers, but they will be much more demanding on feeding and watering than shrubs in the ground would be. They will also need potting on every couple of years so that they don’t suffocate or become stunted in their pot.

Aftercare and Pruning

Once established, shrubs generally do not require much water. However, at first they need careful, frequent watering and should not be left to dry out.

Shrubs in the ground are generally not demanding and in most cases, annual feeding with general purpose fertilizer will suffice. Shrubs in containers may need more feeding; usually from early spring until late summer.

Shrubs also benefit from mulching in order to supress weeds, conserve moisture and provide vital nutrients. Mulch also greatly improves soil conditions. Shrubs can be mulched in late winter, after fertiliser has been applied, but it can be mulched through autumn to late spring as long as the ground is damp.

All shrubs benefit from dead-heading once spent flowers become apparent. Rhododendrons and Lilac especially benefit from the removal of dead flowers.

Some shrubs may show signs of reverted growth or ‘sporting’. This is where random shoots of different leaves associated with the plant’s parentage begin to appear. Most commonly this is where plants with variegated leaves sprout pure green growths instead of variegated ones.

To control reversion, remove reverted shoots promptly to discourage them. Reverted shoots are usually much more vigorous than the variegated ones, and thus should be completely pruned out and cut back into wood containing variegated foliage.

Potential Issues

Although shrubs are usually very robust garden plants, they can sometimes start to decline with no apparent or obvious reason.

This will start with browning leaves, which could indicate plant stress due to lack of water or waterlogging, an establishment failure or, in the worst case scenario, honey fungus. Another cause of leaf browning is a high salt content in the soil. This could be a natural occurrence, especially if you live near the ocean, or it could be from over fertilisation.

To remedy a high salt content, cut back on fertiliser and step up your watering regime for the next few weeks. If you live by the ocean, this will be harder to remedy—but stepping up your watering will help to wash some of the salt away all the same. 

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

Ready to use Helps build soil fertility Encourages strong, healthy growth Increases crop yield Nutrient Content -...
Out of stock

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...
Out of stock
A large deciduous arching, strong growing shrub producing dense clusters of fragrant rich violet-blue flowers, throughout summer. long mid green leaf...
In stock

A large deciduous arching, strong growing shrub producing plumes of deep purple-red flowers, throughout summer. long mid green leaf with a felt like...
In stock

A Buddleja for the pot! A revolution in Buddleja – this one has wonderful rich purple-magenta flowers. Buddleja Buzz ‘Magenta’ are excellent for...
Out of stock

Pre-order* (Ships in 4-6 weeks)
Fragrant bright creamy-white flowers from silken buds before the deciduous narrow deep green leaves form on a superb compact shrub or small tree....
Out of stock

A fantastic, semi-evergreen variety with slender, arching branches and elongated, glossy dark green leaves. It bears delicate, light pink, funnel-shaped...
Out of stock
A stunning English rose by David Austin that is one of the best purple/crimson varieties. Powerful old rose fragrant blooms can be enjoyed in summer. As a...
Out of stock

Fabulous deep pink variety of Astrantia with pincushion-like flowers on tall stems. These appear above mounds of mid-green leaves through summer and into...
In stock

'Midnight Rose' has deep maroon frilled semi-evergreen leaves, finely splashed with brightest pink in spring, turning creamy red on dark burgundy...
In stock

Cornus sericea 'Flaviramea' is a beautiful, deciduous, dense shrub which shows lovely rich golden stems in winter. It is a very hardy plant which is...
In stock

No posts found

Write a Review

You may also like