Photo by Melody

PlantFiles: Rhododendron
Rhododendron oldhamii

Family: Ericaceae (er-ek-AY-see-ee) (Info)
Genus: Rhododendron (roh-do-DEN-dron) (Info)
Species: oldhamii (old-HAM-ee-eye) (Info)

» View all varieties of Azaleas and Rhododendrons

One member has or wants this plant for trade.


36-48 in. (90-120 cm)

36-48 in. (90-120 cm)

USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)

Sun Exposure:
Sun to Partial Shade
Light Shade

Unknown - Tell us

Bloom Color:

Bloom Time:
Mid Spring
Late Spring/Early Summer


Other details:
Average Water Needs; Water regularly; do not overwater
Suitable for growing in containers

Patent Information:
Unknown - Tell us

Seed Collecting:
Unknown - Tell us

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By sube1984
Thumbnail #1 of Rhododendron oldhamii by sube1984

By sube1984
Thumbnail #2 of Rhododendron oldhamii by sube1984


1 positive
1 neutral
No negatives

Gardeners' Notes:

Positive southeastgarden On Sep 21, 2014, southeastgarden from Jacksonville, FL (Zone 9a) wrote:

I purchased Rhododendron oldhamii from a mail order nursery in South Carolina last year and planted it in the shade of a live oak tree in my zone 9a garden in north Florida. It showed no damage from a 21 degree winter low, flowered in April and doubled its size in a year. I watered it regularly by hand for a few months and then left it to fend for itself over a summer of near-average rainfall.

Neutral MotherNature4 On Sep 24, 2005, MotherNature4 from Bartow, FL (Zone 9a) wrote:

Rhododendron oldhamii is a rare Taiwanese azalea that booms in summer. It was crossed with the traditional spring bloomers in the 1980s to produce the The Encore azaleas that repeat their bloom cycle well into the summer and fall.

I don't know of anyone growing Encore azaleas in Florida because of the summer heat and humidity. Have not seen it in nurseries, either. Would love to try them.


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

Goleta, California
Jacksonville, Florida

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