1 Buddleia Black Knight Plant, Purple Butterfly Bush, Hardy Outdoor Garden Shrub, 2L Root-Ball

Buddleia 'Black Knight' is one of the most popular and widely grown butterfly bush varieties, prized for its stunning deep violet-purple flower spikes. Producing long, densely packed panicles of richly fragrant blooms from mid-summer through to early autumn, this vigorous deciduous shrub is a magnet for butterflies, bees and other pollinators. The lance-shaped, grey-green foliage with silvery-white undersides provides an attractive backdrop to the striking dark flowers.

A robust and easy-to-grow garden shrub, Buddleia 'Black Knight' thrives in most well-drained soils and is ideal for adding colour and wildlife interest to borders, cottage gardens and informal planting schemes. Hard pruning in early spring encourages strong new growth and an abundance of flowers on the current season's wood. This variety holds the prestigious RHS Award of Garden Merit (AGM), recognising its outstanding garden performance and reliability.

What's Included:

• 1 x Buddleia 'Black Knight' plant supplied in a 2L pot

Cultural Information:

• Botanical Name: Buddleja davidii 'Black Knight'


• Common Names: Butterfly Bush, Black Knight Buddleia


• Classification: Deciduous Shrub


• Fully Grown Height and Spread: 2–3 m × 1.5–2.5 m


• Growth Habit: Vigorous, Upright to Arching Deciduous Shrub


• Perfect For: Borders, Cottage Gardens, Wildlife Gardens, Informal Planting Schemes


• Flowering Time: Mid-Summer to Early Autumn (July–September)


• Flower Colour: Deep Violet-Purple with Small Orange Eye


• Fragrance: Yes – Honey-Scented Blooms


• Planting Position: Full Sun


• Soil Type: Most Well-Drained Soils, Including Chalk


• Hardiness: Fully Hardy (RHS H5)


• Pruning: Hard Prune in Early Spring (March) to Around 30–45 cm


• Attracts: Butterflies, Bees and Other Pollinators


• Type: Hardy Deciduous Shrub


• Foliage: Lance-Shaped, Grey-Green Leaves with Silvery-White Undersides


• Award: RHS Award of Garden Merit (AGM)

Notes: This listing is for the 'Black Knight' variety, distinguished by its exceptionally deep violet-purple blooms – among the darkest of all Buddleia cultivars.

Free UK Delivery on Every Order

All orders placed Monday–Thursday before 2pm are packed the next working day and delivered within 24 hours of dispatch.

Example: Order on Monday → packed Tuesday → delivered Wednesday.

Orders placed Friday–Sunday are packed and shipped on Monday. We don't dispatch on weekends to ensure your plants travel fresh.

How Your Plants Arrive
Every plant is individually wrapped in our plastic-free packaging and secured in a custom box designed to keep them upright and protected in transit. If anything arrives damaged, get in touch — we'll replace it.

Returns
Not happy? Contact us within 14 days of delivery and we'll sort it out. See our full returns policy here.