Buddleia ‘Black Knight’ — Deciduous Shrub, Bee-Friendly, 2L Pot
Buddleia ‘Black Knight’ — Deciduous Shrub, Bee-Friendly, 2L Pot
Buddleia ‘Black Knight’ — a hardy garden shrub with deep violet-purple with small orange eye and flowering mid-summer to early autumn. A reliable nectar source for bees and pollinators. Supplied as an established specimen in a 2L pot, grown peat-free at our Yorkshire nursery and ready to plant out.
At a glance
- Type: Deciduous Shrub
- Flowering: Mid-Summer to Early Autumn (July–September)
- Position: Full Sun
- Attracts: Butterflies, Bees and Other Pollinators
- Supplied as: Single plant in a 2L pot
The detail
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.
Why ours
Grown by us in Yorkshire, in peat-free compost, shipped in plastic-free packaging. Every plant arrives strong, well-rooted and ready to thrive — not weeks of waiting before it gets going. Each order includes access to our free care app with planting and seasonal care reminders.
How to grow
| Botanical name | Buddleja davidii 'Black Knight' |
| Growth habit | Vigorous, Upright to Arching Deciduous Shrub |
| Position | Full Sun |
| Soil | Most Well-Drained Soils, Including Chalk |
| Flowering | Mid-Summer to Early Autumn (July–September) |
| Hardiness | Fully Hardy (RHS H5) |
| Attracts | Butterflies, Bees and Other Pollinators |
| Best for | Borders, Cottage Gardens, Wildlife Gardens, Informal Planting Schemes |
Frequently asked
How big will it grow?
Mature size varies, see the cultural information above. Most established shrubs reach mature size within 3–5 years.
When should I plant it?
Container-grown shrubs can be planted year-round in the UK, but autumn and spring give the best establishment. Avoid planting in extreme heat or frozen ground.
When does it flower?
Expect flowers from mid-summer to early autumn (july–september).
What size pot does it arrive in?
Supplied as a single specimen in 2L pot, well-rooted and ready to plant out or pot on.