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Yellow azalea

Yellow azalea

Rhododendron luteum
The only azalea native to Europe, also called honeysuckle or pontic azalea: a deciduous shrub of mountain meadows and open woods from Poland and Austria through the Balkans to Turkey and the Caucasus. In May it covers its bare twigs with dense clusters of bright yellow, sweetly fragrant funnel-shaped flowers, and its leaves turn yellow, orange and red in fall. It wants acid soil and light shade. Every part is poisonous, and honey made from its nectar is the "mad honey" of the Black Sea coast. In Great Britain it is listed as an invasive non-native species.
Climate fit: narrow (30/100)
Focal point
Border
Pollinator
Light
Part sun / Part shade
Water
Consistent moisture
Mature size
8.2-13.1 ft tall · 6 ft apart
Hardy in zones
6a-9b
cold to frosty winters
Life cycle
Perennial
Bloom period
Spring
Native in Illinois
No

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NC State Extension and the Missouri Botanical Garden list it as attracting hummingbirds, butterflies and bees in US gardens, and NC State notes that the genus supports a specialist mining bee, Andrena cornelli.

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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Full sun / Part sun / Part shade
Moderate water
Zones 7a-9b
Climate: narrow
Border
Focal point
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Pollinator
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Shrub
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Focal point
Pollinator
Border
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Shrub
Full sun / Part shade
Consistent moisture
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Focal point
Border
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Pollinator

Educator packet

Plant packet
Yellow azalea educator packet
The only azalea native to Europe, also called honeysuckle or pontic azalea: a deciduous shrub of mountain meadows and open woods from Poland and Austria through the Balkans to Turkey and the Caucasus. In May it covers its bare twigs with dense clusters of bright yellow, sweetly fragrant funnel-shaped flowers, and its leaves turn yellow, orange and red in fall. It wants acid soil and light shade. Every part is poisonous, and honey made from its nectar is the "mad honey" of the Black Sea coast. In Great Britain it is listed as an invasive non-native species.
Scientific name
Rhododendron luteum
Plant type
shrub
Hardiness
6a-9b
Light
part-sun, part-shade
Moisture
consistent
Spacing
6 ft
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). Yellow azalea (Rhododendron luteum). Retrieved 2026, October 19, from https://plotwright.com/plants/rhododendron-luteum
Sources used for this record
This record is compiled from the sources below.
NC State Extension Gardener Plant Toolbox
University extension service
Missouri Botanical Garden PlantFinder
Botanical research database
RHS Find a Plant
Botanical research database
GBIF
Botanical research database
Wikipedia (ecoregion articles)
Botanical research database
Wikimedia Commons
Photo · CC BY-SA 4.0
Plants For A Future
Botanical research database
Wikipedia (ecoregion articles)
Botanical research database