Index / Search / Rhododendron viscosum
§1 Plant
Rhododendron viscosum (L.) Torr.
vernacular swamp azalea — species · Ericaceae
§2Habit & range
Habit and range
- Growth habit
- Shrub
- Duration
- Perennial
- Group
- Dicot
- Family
- Ericaceae Juss.
- Genus
- Rhododendron
§2a
Native status, by region
- L48 Lower 48 States Native
§2b
County-level range
· 404 counties across 22 states/territories§3Cultivation specs · USDA
Recorded by the USDA Plant Materials Program.
§3a
Tolerances
- Drought
- Medium
- Shade
- Low
- Moisture use
- High
- Fire
- Low
- Salinity
- None
- Anaerobic
- Medium
- CaCO₃
- Low
- Hedging
- None
§3b
Climate & soil
- Cold tolerance
- -18 °F minimum
- Frost-free days
- 160 min.
- Precipitation
- 35–55 in/yr
- pH range
- 4–7
- Root depth
- 14 in min.
- Fertility need
- Low
- Soil texture
- coarse, medium, fine
§3c
Form & growth
- Growth form
- Multiple Stem
- Growth rate
- Slow
- Lifespan
- Moderate
- Mature height
- 16 ft
- Height @ 20 y
- 13 ft
- Foliage texture
- Medium
- Foliage colour
- Green
- Porosity (summer)
- Moderate
- Porosity (winter)
- Porous
- Flower colour
- Red
- Fire resistant
- No
- N fixation
- None
- Toxicity
- None
§3d
Reproduction
- Bloom period
- Indeterminate
- Seed abundance
- Medium
- Seed begins
- Summer
- Seed ends
- Fall
- Spread rate
- Slow
- Stratify
- No
- Propagation
- seed, bare root, container
§3e
Use & availability
- Commercial availability
- Routinely Available
- Nursery stock
- No
- Browse palatability
- Low
- Palatable, human
- No
- Lumber
- No
- Christmas tree
- No
§4Counties, by state
Recorded in 404 counties across 22 states/territories.
Alabama view state ↗ 11 N ▾
Arkansas view state ↗ 29 N ▾
- Ashley 05003
- Clark 05019
- Cleburne 05023
- Columbia 05027
- Dallas 05039
- Faulkner 05045
- Garland 05051
- Grant 05053
- Hempstead 05057
- Hot Spring 05059
- Independence 05063
- Jefferson 05069
- Lafayette 05073
- Miller 05091
- Montgomery 05097
- Nevada 05099
- Newton 05101
- Ouachita 05103
- Pike 05109
- Polk 05113
- Pope 05115
- Pulaski 05119
- Saline 05125
- Scott 05127
- Stone 05137
- Union 05139
- Van Buren 05141
- Washington 05143
- Yell 05149
Delaware view state ↗ 2 N ▾
District of Columbia view state ↗ 1 N ▾
Florida view state ↗ 36 N ▾
- Alachua 12001
- Baker 12003
- Bay 12005
- Calhoun 12013
- Clay 12019
- DeSoto 12027
- Escambia 12033
- Franklin 12037
- Gadsden 12039
- Gulf 12045
- Hamilton 12047
- Hardee 12049
- Hernando 12053
- Highlands 12055
- Hillsborough 12057
- Jackson 12063
- Jefferson 12065
- Lake 12069
- Leon 12073
- Liberty 12077
- Manatee 12081
- Marion 12083
- Nassau 12089
- Okaloosa 12091
- Orange 12095
- Osceola 12097
- Pasco 12101
- Polk 12105
- Putnam 12107
- Santa Rosa 12113
- Seminole 12117
- Taylor 12123
- Union 12125
- Wakulla 12129
- Walton 12131
- Washington 12133
Georgia view state ↗ 61 N ▾
- Appling 13001
- Bacon 13005
- Baker 13007
- Barrow 13013
- Bartow 13015
- Ben Hill 13017
- Berrien 13019
- Bibb 13021
- Brantley 13025
- Brooks 13027
- Bryan 13029
- Bulloch 13031
- Camden 13039
- Candler 13043
- Charlton 13049
- Clay 13061
- Clinch 13065
- Coffee 13069
- Colquitt 13071
- Cook 13075
- Decatur 13087
- Dodge 13091
- Early 13099
- Echols 13101
- Effingham 13103
- Emanuel 13107
- Evans 13109
- Grady 13131
- Harris 13145
- Heard 13149
- Irwin 13155
- Jackson 13157
- Jasper 13159
- Jeff Davis 13161
- Jefferson 13163
- Lanier 13173
- Lee 13177
- Long 13183
- Lowndes 13185
- McDuffie 13189
- McIntosh 13191
- Meriwether 13199
- Oconee 13219
- Pierce 13229
- Polk 13233
- Rabun 13241
- Randolph 13243
- Richmond 13245
- Screven 13251
- Tattnall 13267
- Taylor 13269
- Thomas 13275
- Tift 13277
- Turner 13287
- Union 13291
- Ware 13299
- Wayne 13305
- Wheeler 13309
- White 13311
- Wilcox 13315
- Worth 13321
Louisiana view state ↗ 20 N ▾
Maine view state ↗ 1 N ▾
Maryland view state ↗ 1 N ▾
Massachusetts view state ↗ 12 N ▾
Mississippi view state ↗ 12 N ▾
New Hampshire view state ↗ 2 N ▾
New Jersey view state ↗ 21 N ▾
New York view state ↗ 21 N ▾
North Carolina view state ↗ 49 N ▾
- Alexander 37003
- Alleghany 37005
- Anson 37007
- Ashe 37009
- Avery 37011
- Beaufort 37013
- Bertie 37015
- Bladen 37017
- Brunswick 37019
- Buncombe 37021
- Chowan 37041
- Clay 37043
- Columbus 37047
- Craven 37049
- Cumberland 37051
- Davidson 37057
- Duplin 37061
- Gates 37073
- Guilford 37081
- Harnett 37085
- Haywood 37087
- Henderson 37089
- Hertford 37091
- Hoke 37093
- Iredell 37097
- Jackson 37099
- Lee 37105
- Lincoln 37109
- Macon 37113
- Martin 37117
- McDowell 37111
- Montgomery 37123
- Moore 37125
- Nash 37127
- Onslow 37133
- Pender 37141
- Pitt 37147
- Richmond 37153
- Robeson 37155
- Rowan 37159
- Rutherford 37161
- Sampson 37163
- Scotland 37165
- Transylvania 37175
- Union 37179
- Vance 37181
- Wake 37183
- Washington 37187
- Watauga 37189
Pennsylvania view state ↗ 23 N ▾
- Bedford 42009
- Berks 42011
- Bucks 42017
- Carbon 42025
- Centre 42027
- Chester 42029
- Clinton 42035
- Cumberland 42041
- Dauphin 42043
- Delaware 42045
- Fayette 42051
- Franklin 42055
- Lancaster 42071
- Lebanon 42075
- Lehigh 42077
- Monroe 42089
- Montgomery 42091
- Northampton 42095
- Philadelphia 42101
- Pike 42103
- Schuylkill 42107
- Warren 42123
- Wayne 42127
Rhode Island view state ↗ 4 N ▾
South Carolina view state ↗ 23 N ▾
- Aiken 45003
- Barnwell 45011
- Berkeley 45015
- Charleston 45019
- Chesterfield 45025
- Clarendon 45027
- Colleton 45029
- Darlington 45031
- Dillon 45033
- Georgetown 45043
- Greenwood 45047
- Hampton 45049
- Jasper 45053
- Kershaw 45055
- Lancaster 45057
- Lexington 45063
- Marion 45067
- Marlboro 45069
- Oconee 45073
- Orangeburg 45075
- Pickens 45077
- Richland 45079
- Saluda 45081
Tennessee view state ↗ 6 N ▾
Vermont view state ↗ 1 N ▾
Virginia view state ↗ 64 N ▾
- Accomack 51001
- Albemarle 51003
- Alleghany 51005
- Amelia 51007
- Arlington 51013
- Augusta 51015
- Bath 51017
- Brunswick 51025
- Caroline 51033
- Carroll 51035
- Charles City 51036
- Chesapeake (city) 51550
- Chesterfield 51041
- Craig 51045
- Cumberland 51049
- Dinwiddie 51053
- Essex 51057
- Fairfax 51059
- Fauquier 51061
- Floyd 51063
- Frederick 51069
- Giles 51071
- Gloucester 51073
- Grayson 51077
- Greensville 51081
- Hampton (city) 51650
- Hanover 51085
- Henrico 51087
- Isle of Wight 51093
- James City 51095
- King and Queen 51097
- King George 51099
- King William 51101
- Lancaster 51103
- Loudoun 51107
- Lunenburg 51111
- Madison 51113
- Mathews 51115
- Middlesex 51119
- New Kent 51127
- Newport News (city) 51700
- Northampton 51131
- Northumberland 51133
- Nottoway 51135
- Page 51139
- Patrick 51141
- Prince George 51149
- Prince William 51153
- Rappahannock 51157
- Richmond 51159
- Russell 51167
- Shenandoah 51171
- Smyth 51173
- Southampton 51175
- Spotsylvania 51177
- Stafford 51179
- Suffolk (city) 51800
- Surry 51181
- Sussex 51183
- Tazewell 51185
- Virginia Beach (city) 51810
- Warren 51187
- Westmoreland 51193
- Wise 51195
West Virginia view state ↗ 4 N ▾
§5Sources & provenance
USDA PLANTS
Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.
plants.usda.gov/RHVI2 ↗GBIF Backbone
Canonical taxonomic identity, synonym resolution, cross-refs. CC0.
gbif.org/species/2883059 ↗Record version
Cached and built locally. Source version on this record:
usda-plants-mt-2026-05-26
fetched 2026-05-26T06:33:17Z