American Rhododendron Society Web Site ARS
navigation menu background

Rhododendron Plant Search

New Search

  "Printer Friendly" Page

More Information: Rhododendron 'Humboldt'


R. 'Humboldt' 
Photo: Diane Weissman

Predominant Flower Color:  Lavender

Flower/Truss Description:  Flower 2" to 3" across, very pale purple with blackish-red markings. Held in ball-shaped truss with 16-20 flowers.

Fragrant:  No

Bloom Time:  Late Midseason

Foliage Description / Plant Habit:  Leaves ovate, 4" to 6" long, dark green. Upright, well-branched plant.

Height:  5 feet in 10 years.

Cold Hardiness Temp:  -20F  ( -29C)

Parentage  (Seed Parent x Pollen Parent):  catawbiense x unknown

Elepidote (E) or Lepidote (L):  E

Hybridizer:  Seidel

Registration Reference:  RHS 58

Note: Bloom time and 10 year height information are approximate and can vary dependent on weather and growing conditions.
Cold hardiness temperature is also an approximate value.


American Rhododendron Society
P.O. Box 214, Great River, NY 11739
Ph: 631-533-0375   Fax: 866-883-8019   E-Mail: member@arsoffice.org
1998-2016, ARS, All rights reserved.