Monarch Blue Knight Buddleia

Blue Knight Butterfly Bush (Buddleia davidii 'Blue Knight') is one of the most striking butterfly bushes available — large 10–12 inch panicles that open lavender and deepen to a rich blue-purple as they mature, with a sweet honey fragrance that draws butterflies, bees, and hummingbirds from midsummer through early fall. Part of the Monarch® Butterfly Bush Collection by Walters Gardens, it's compact enough for residential landscapes and blooms reliably late in the season when most other shrubs have finished.

Why Gardeners Choose Blue Knight Butterfly Bush

• Exceptional bloom color: Panicles transition from lavender to deep blue-purple as they mature — one of the richest blues in the butterfly bush category.
• Massive bloom panicles: 10–12 inch flower spikes create a bold, showy display from late summer through early fall.
• Hummingbird and butterfly magnet: Honey-scented blooms are irresistible to butterflies, bees, and hummingbirds.
• Long late-season color: Blooms arrive when most summer perennials are winding down — extends the garden season significantly.
• Compact size: Grows 4–5 feet tall and up to 6.5 feet wide — well-scaled for residential borders and pollinator gardens.
• Low maintenance: Minimal care needed once established.

Planting & Care

• Light: Full sun for best blooming.
• Soil: Fertile, moist, well-drained.
• Watering: Minimal once established.
• Pruning: Cut back old wood hard in early spring before new growth emerges to encourage vigorous new shoots and heavy blooming.
• Companions: Pairs beautifully with Echinacea, lavender, Veronica, Coreopsis, and ornamental grasses.

Shipping Information

• Ships in pint and quart pots, fully rooted and ready to plant.
• Cannot ship to: Maryland, Oregon, Pennsylvania, or Washington.