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PlantFiles: Flame Azalea
Rhododendron calendulaceum

 
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Family: Ericaceae (er-ek-AY-see-ee) (Info)
Genus: Rhododendron (roh-do-DEN-dron) (Info)
Species: calendulaceum (kal-en-dew-LAY-see-um) (Info)

Synonym:Azalea calendulacea
Synonym:Azalea lutea

» View all varieties of Azaleas and Rhododendrons

3 vendors have this plant for sale.

5 members have or want this plant for trade.

Category:
Shrubs

Height:
6-8 ft. (1.8-2.4 m)

Spacing:
6-8 ft. (1.8-2.4 m)

Hardiness:
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)

Sun Exposure:
Light Shade

Danger:
All parts of plant are poisonous if ingested

Bloom Color:
Red
Coral/Apricot
Orange
Red-Orange
Bright Yellow

Bloom Time:
Late Winter/Early Spring
Mid Spring
Late Spring/Early Summer

Foliage:
Deciduous

Other details:
Average Water Needs; Water regularly; do not overwater
Flowers are fragrant

Soil pH requirements:
4.6 to 5.0 (highly acidic)
5.1 to 5.5 (strongly acidic)
5.6 to 6.0 (acidic)

Patent Information:
Non-patented

Propagation Methods:
From semi-hardwood cuttings
From hardwood cuttings
By stooling or mound layering

Seed Collecting:
Unknown - Tell us

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to view:

By wihead
Thumbnail #1 of Rhododendron calendulaceum by wihead

By ArtyMiss
Thumbnail #2 of Rhododendron calendulaceum by ArtyMiss

By xyris
Thumbnail #3 of Rhododendron calendulaceum by xyris

By xyris
Thumbnail #4 of Rhododendron calendulaceum by xyris

By xyris
Thumbnail #5 of Rhododendron calendulaceum by xyris

By irmaly
Thumbnail #6 of Rhododendron calendulaceum by irmaly

By Sir_Vili
Thumbnail #7 of Rhododendron calendulaceum by Sir_Vili

There are a total of 10 photos.
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Profile:

1 positive
2 neutrals
No negatives

Gardeners' Notes:

RatingAuthorComment
Neutral Joan On Aug 20, 2009, Joan from Belfield, ND (Zone 4a) wrote:


Editor's Note

Some resources list all parts of Rododendrons and Azaleas as poisonous if ingested.

The toxic principal is Andromedotoxin, and symptoms include salivation, watering of eyes and nose, abdominal pain, loss of energy, depression, nausea and vomiting, diarrhea, weakness, difficult breathing, progressive paralysis of arms and legs, coma.

We tend to err on the side of caution in PlantFiles, and the danger notation in the details above is to caution gardeners, parents and pet owners to look further for more information.
Positive xyris On Jun 29, 2004, xyris from Sebring, FL (Zone 9b) wrote:

A spectacular flowering shrub of the Southern Appalachians, from southern PA and OH s to northern GA and AL. Perhaps there is no better place to see this plant in the wild than along the Blue Ridge Parkway, where it is possible to see examples of its continuous flower color variation from pale yellow to deep orange-red in early June. My father cultivated a large collection of forms of this species in western North Carolina.

Neutral haleygem On Aug 20, 2003, haleygem from Saugus, MA wrote:

The plant has a gorgeous color when in bloom however to much shade will make for few blooms. Grows in the shape of a tall shrub that is easy to trim and shape. Can be used as an edger or border plant.

Regional...

This plant has been said to grow in the following regions:

Sebastopol, California
Hampton, Florida
Keystone Heights, Florida
Tiger, Georgia
Saugus, Massachusetts
Asheville, North Carolina
Lake Toxaway, North Carolina
Morganton, North Carolina
Prospect Park, Pennsylvania
Conway, South Carolina
Lafayette, Tennessee
Richlands, Virginia
Sultan, Washington
Harpers Ferry, West Virginia



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