Buddleia 'Black Knight'

Butterfly Bush 'Black Knight'

Buddleia davidii 'Black Knight' also known as Butterfly Bush 'Black Knight' is a deciduous, vigorous shrub with deep purple-violet, sweetly scented flower spikes which attract a number of pollinators, most notably butterflies and for which it is named. A current favourite in gardens today, the Buddleia 'Black Knight' has long, lance-like green leaves with pale undersides and a slightly arching habit. The flowering period is between July and September, ideal for pollinators needing food a little later in the summer season and for extending the blooming season in the garden.  In autumn the leaves turn to a buttery-gold before falling.

Buddleia 'Black Knight' is a bushy shrub with fairly vigorous growth - up to 40cm a year. It can grow to around 10ft tall and equally wide so will benefit from a decent amount of space in a sunny bed or border in which to thrive. Deadheading the flowers once spent will encourage more blooms and a hard prune around March will ensure good growth and flower production come the summer.

A recipient of the RHS 'Award of Garden Merit', this pretty and fragrant plant is certainly eye-catching and is ideal for sunnier positions, although it will tolerate partial shade. Grow in fertile soil of any type with average moisture and well drained.

More Information

  • Berry Colour None
  • Deciduous Yes
  • Semi Evergreen No
  • Evergreen No
  • Flower Colour Purple
  • Grows Up To 3m
  • Has Berries No
  • Is Edible No
  • Native No

Deadhead any spent blooms in summer to encourage further flower production. Hard prune the plant in March back to three or four buds to encourage healthy growth and abundant flower production in the summer.

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    More Information
    Berry ColourNone
    Semi EvergreenNo
    Flower ColourPurple
    Grows Up To3m
    Has BerriesNo
    Is EdibleNo

    Delivery Information

    • Orders £100 and over to mainland UK are delivered FREE for box deliveries
    • Our delivery lead time is currently within 3-5 days. *Some troughs and trees may take up to 14 days at present.
    • Orders under £100 to mainland UK £7.99 (box delivery).
    • Orders requiring a pallet delivery, free delivery over £300 or a £30 pallet charge if the order is under £300.
    • Bespoke deliveries that require a dedicated vehicle is a charge of £300 or free on orders over £1000.
    • We can deliver to Scottish Highlands & Islands, Channel Islands, Isle of Wight and Isle Man, but the delivery cost will need to be quoted by one of our team, so please contact us on

    For some plants that are too heavy or too tall to be packed in cardboard boxes we use pallet deliveries. In these circumstances, we require a minimum order value of £300 for free delivery, or you can make a contribution towards the delivery cost. Look out for the information on product pages which explains this further where applicable and if your order is for less than £300 please call or email us to agree a delivery contribution. This requirement only applies to those plants where it is clearly indicated on the product page.

    For delivery information for other products please see here.

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    The award-winning Buddleia ‘Black Knight’ Butterfly Bush features long, intense indigo flower spikes, sweetly fragrant, between July and September which encourage beneficial pollinators, including butterflies to the garden. A fast-growing, bushy, deciduous shrub with long lance-like green leaves, it enjoys a sunny bed or border and thrives in most soil types. Growth can be up to 3m after 5-10 years. Overall very low maintenance and considered easy to grow. Drought resistant.