Butterfly bush lives up to its name — fragrant purple, pink, or white panicles attract butterflies in clouds. Choose sterile varieties (Lo & Behold, Flutterby series) to avoid invasive reseeding in ecologically sensitive areas.
Sun: Full sun. Water: Low. Zones: 5–9. Height: 3–10 ft. Bloom time: Mid-summer to fall.
Plant in well-drained soil in full sun. Cut back hard to 12 inches in early spring — blooms on new wood. Deadhead spent panicles to extend flowering. Choose sterile cultivars in regions where Buddleia is invasive.
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01 Is butterfly bush invasive?
Seeded varieties are invasive in the Pacific Northwest and parts of the East. Plant sterile cultivars like Lo & Behold, Flutterby, or Miss series — they set no viable seed and are sold in ecologically sensitive states. Check your state extension for local guidance.
02 When should I prune butterfly bush?
Early spring — cut back hard to 12 inches. Butterfly bush blooms on new wood, so hard pruning produces bushier plants with more flowers. Don't prune in fall; leave the stems for winter protection in zones 5–6.
03 Why is my butterfly bush not blooming?
Most likely: too much shade or too little pruning. Needs full sun (6+ hours) and aggressive spring pruning. Also: deadhead spent panicles through summer to keep new flowers coming — unpruned plants stop producing new blooms by August.