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Butterfly bush

Butterfly bush

Buddleja davidii
An arching, multi-stemmed deciduous-to-semi-evergreen shrub grown for its long, cone-shaped summer-to-frost panicles of small, honey-scented flowers in purple, magenta, pink, or white. Native to central and western China, it is one of the most magnetic adult-butterfly NECTAR plants you can grow in a hot, sunny border. The honest catch: despite the name it hosts no native butterfly larvae, so it feeds adults but raises none - and the straight species is invasive, escaping along rivers and disturbed ground. Grow it for nectar with eyes open: deadhead it, choose a sterile cultivar, and back it with true native host plants.
Climate fit: moderate (48/100)
Pollinator
Border
Focal point
Light
Full sun
Water
Moderate water
Mature size
6-12 ft tall · 5 ft apart
Hardy in zones
5a-9b
very cold to frosty winters
AHS heat range
4-11
Plant range authored in AHS heat-zone terms.
Native in Illinois
No

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Grown purely as an ornamental nectar shrub - butterfly bush has no culinary use and no part of it is eaten.

Cold hardiness

These values are location-based: this location's current hardiness is the baseline, and the 2050 value is a projected future climate for this same location.
Now
Zone 6b
Plotwright
USDA Zone 6b
-5°F to 0°F
Well-suited
Zone 7a
Plotwright
0°F to 5°F
Well-suited
In plain terms: This location has cold winters. Its winters are projected to keep warming through 2050.
Well-suited today and still thriving in 2050.

Heat tolerance

Heat tolerance values are location-based too: heat days today are observed at this site, and the 2050 value projects this same location under a future climate.
Loading AHS heat-zone data for this location...

Similar plants

Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.
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Educator packet

Plant packet
Butterfly bush educator packet
An arching, multi-stemmed deciduous-to-semi-evergreen shrub grown for its long, cone-shaped summer-to-frost panicles of small, honey-scented flowers in purple, magenta, pink, or white. Native to central and western China, it is one of the most magnetic adult-butterfly NECTAR plants you can grow in a hot, sunny border. The honest catch: despite the name it hosts no native butterfly larvae, so it feeds adults but raises none - and the straight species is invasive, escaping along rivers and disturbed ground. Grow it for nectar with eyes open: deadhead it, choose a sterile cultivar, and back it with true native host plants.
Scientific name
Buddleja davidii
Plant type
shrub
Hardiness
5a-9b
Light
full-sun
Moisture
moderate
Spacing
60 inches
Classroom prompts
- Which plant traits are observations, and which are care recommendations?
- How would this plant fit change if the garden location moved warmer, colder, wetter, or drier?
- Which source-backed facts would you cite in a lesson handout?
Use the Sources & citations section below for page citation styles and the field-level source list.

Sources & citations

Cite this page
For lesson plans, articles, or research that uses this page. Use the source cards below to explore the references that informed this record.
Plotwright. (2026, May 17). Butterfly bush (Buddleja davidii). Retrieved 2026, August 20, from https://plotwright.com/plants/buddleja-davidii
Sources used for this record
This record is compiled from the sources below.
Plants of the World Online (POWO)
Botanical research database
NC State Extension Gardener Plant Toolbox
University extension service
USDA PLANTS Database
Government data source
GBIF
Botanical research database
Wikimedia Commons
Photo · CC BY-SA 4.0