ARS Logo


Description of Rhododendron calendulaceum

R. calendulaceum 
Photo by: Sally and John Perkins

Predominant Flower Color: 

Orange, Red, Yellow 

 Flower / Truss Description: 

Funnel shaped, shades of orange, scarlet and yellow. Sometimes slightly scented. Inflorescence 5-9 flowered. 


Yes sometimes  

Bloom Time: 

Late Midseason to Late 

Height (ft.) in 10 Yrs: 

Cold Hardiness Temperature: 

-20F (-29C)

Foliage Description: 

Leaves ovate or obovate to elliptic, up to 3" long, deciduous. 

Elepidote (E) or Lepidote (L): 


Plant Habit: 

Upright spreading shrub or small tree 

Sub Genus: 




Sub Section: 


Geographical Origin: 

E N America (Pennsylvania to N Georgia) 

 Note: Bloom time and 10 year height information are approximate and can vary dependent on local climate and soil conditions.
Hardiness temperature is also an approximate guideline.

American Rhododendron Society
Executive Director: P.O. Box 525,  Niagara Falls, NY 14304
Ph: 416-424-1942   Fax: 905-262-1999   E-Mail:
1998-2015, ARS, All rights reserved.