Butterfly Bush
Buddleja davidii
Fast-growing shrub with long fragrant flower spikes that attract butterflies.
Care Instructions
Water weekly when young, every 2 weeks once established. Drought-tolerant but blooms best with consistent moisture. Avoid waterlogged conditions.
Full sun (6–8 hours minimum). More sun equals more blooms. Shaded butterfly bushes are leggy with reduced flowering.
Average, well-drained soil with pH 6.0–7.0. Does not need fertilizer — too much nitrogen reduces blooms and increases invasive spread. Lean soil is fine.
Seasonal Guide
Best Planting Time
Spring after last frost. Fast-growing; will reach blooming size within the first season from a quart-sized plant.
Bloom / Growth Season
Blooms on new wood July–frost. Cut back hard (to 12 inches) in early spring before new growth to maintain shape and maximize blooms.
Dormancy
May die back to ground in zones 5–6 (treat as perennial). In zones 7+, prune back by half in fall, hard prune in early spring.
Common Problems & Solutions
Invasive spreading (in some states)
Choose sterile varieties (Lo & Behold series, Flutterby series). Deadhead before seeds set. Check your state invasive species list.
Spider mites in hot, dry weather
Spray undersides of leaves with strong water stream. Apply neem oil. Increase humidity around plant with mulch.
No butterfly visits despite blooms
Ensure host plants for caterpillars are nearby. Buddleia attracts adult butterflies for nectar but does not support larvae.
Plant Details
USDA Zones
5a, 5b, 6a, 6b +5
Maintenance
low
Mature Height
6-12 ft
Native Regions
China
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