Swamp azalea
Rhododendron viscosum (L.) Torr.
- light
- Part sun
- water
- Medium
- tall
- 2.1 m
- wide
- 2.5 m
Ericaceae
Formerly Anthodendron viscosum, Azalea glauca, Azalea hispida, Azalea nitida, and 11 more
When it flowers
Not known yet in the tropics: too few flowering observations to read a season from.
Read from iNaturalist photographs of it in flower. A month counts at 50% of the best month's flowering share (smoothed over three months) and 10% of its flowering count, from at least 100 flowering observations in the band.
If a child, a pet or anyone may have eaten a plant, contact a doctor or vet straight away, or call the National Poisons Information Centre (AIIMS, New Delhi) on 1800 116 117, free and open 24 hours.
Something wrong with it?About it
- Grows as
- Shrub or treeKew's checklist, not yet checked
- Climate
- TemperateKew's checklist, not yet checked
- Wild in
- EC. & E. U.S.A.Kew's checklist, not yet checked
- Light
- Part shade (3 to 6 h)Read from NC State Extension, Pinelands Alliance and Wikipedia, checked by a majority of its sourcesBacked by all 3 sources. Sources differ: NC State Extension full, part; Pinelands Alliance part; Wikipedia part
- Height
- 2.1 mRead from NC State Extension, Pinelands Alliance and Wikipedia, checked by a majority of its sourcesBacked by 2 of 3 sources. Sources differ: NC State Extension 2–8 ft; Pinelands Alliance 7–7 ft; Wikipedia 2.5–2.5 m
- Spread
- 2.5 mRead from NC State Extension, Pinelands Alliance and Wikipedia, checked: the middle of what its sources sayThe middle of 3 sources, which all differ. Sources differ: NC State Extension 3–8 ft; Pinelands Alliance 12–12 ft; Wikipedia 2.5–2.5 m
- Water
- Average: moist, well drainedRead from NC State Extension and Pinelands Alliance, not yet checked: its sources are splitTied: no reading has a majority of the 2 sources, so all are kept for a person to settle. Sources differ: NC State Extension medium; Pinelands Alliance high
- Flowers
- WhiteRead from NC State Extension, Pinelands Alliance and Wikipedia, checked by a majority of its sourcesBacked by all 3 sources. Sources differ: NC State Extension white; Pinelands Alliance white; Wikipedia pink, white
- Coldest it survives
- -27.2 °C (USDA zone 5a)Read from NC State Extension and Wikipedia, checked: the middle of what its sources sayHalfway between its 2 sources, which differ. Sources differ: NC State Extension -34.4 °C; Wikipedia -20 °C
Not known yet: heat, hottest it survives.
In other languages (5)
- root
- RHOVIS
- Czech
- pěnišník lepkavý
- Russian
- Рододендрон клейкий
- Finnish
- tuoksuatsalea
- Slovak
- rododendron lepkavý
Where this comes from
- iNaturalist, read 2026-10-25, CC0-1.0 (observation counts)
- Wikidata, read 2026-10-25, CC0-1.0
- Kew's checklist, read 2026-10-24, CC-BY-4.0
- NC State Extension, read 2026-10-25, fact, cited
- Pinelands Alliance, read 2026-10-25, fact, cited
- Wikipedia, read 2026-10-25, fact, cited
- Wikimedia Commons, read 2026-10-25, Public domain
- iNaturalist, read 2026-10-25, CC BY-SA
- iNaturalist, read 2026-10-25, CC BY
- iNaturalist, read 2026-10-25, CC0
- 3D model: Rhododendron viscosum (built for Vanagrha) by Vanagrha, own
A fact “checked by a majority of its sources” was settled by a vote of the pages it was read from, not by a person reading it; one marked “one source” rests on that page alone. Anything else not marked checked has not been checked yet. Where nothing is known, the page says so rather than guess.