Rhododendron Species, Dwarf Rhododendron

Rhododendron impeditum

Family: Ericaceae (er-ek-AY-see-ee) (Info)
Genus: Rhododendron (roh-do-DEN-dron) (Info)
Species: impeditum (im-ped-EYE-tum) (Info)
Synonym:Rhododendron litangense
» View all varieties of Azaleas and Rhododendrons




6-12 in. (15-30 cm)


12-15 in. (30-38 cm)

15-18 in. (38-45 cm)

18-24 in. (45-60 cm)


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)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:

Full Sun


All parts of plant are poisonous if ingested

Bloom Color:


Bloom Time:

Late Winter/Early Spring

Mid Spring




Other details:

Unknown - Tell us

Patent Information:


Seed Collecting:

Allow pods to dry on plant; break open to collect seeds

Foliage Color:


Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


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

Lexington, Kentucky

Watertown, New York

, Newfoundland and Labrador

Euclid, Ohio

Hilliard, Ohio

Oklahoma City, Oklahoma

Coos Bay, Oregon

Portland, Oregon

Dover, Pennsylvania

Sweetwater, Tennessee

Saint Albans, Vermont

Sequim, Washington

Spokane, Washington

Woodinville, Washington

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Gardeners' Notes:


On Apr 25, 2017, AC30 from Sequim, WA wrote:

Interesting to see all the trouble that folks are having with this plant. I have had five of them for anywhere from 5-15 years, and they are all thriving. They are slow growers, but put out nice flowers every spring.


On Apr 23, 2017, sladeofsky from Louisville, KY (Zone 6b) wrote:

This species has been used to produce most of the "blue" hybrid Rhododendrons.


On May 23, 2016, Justintim64 from Lexington, KY wrote:

Bought 4 last year because the nursery said they would take shade. Came back this year butonly a few flowers on one plant. The one that bloom get part shade. The one in full sun doesn't have any flowers. They all look healthy. I have not been able to find much info on it.


On Jul 10, 2010, themikeman from Concord, NC (Zone 7a) wrote:

extremely beautiful, but also extremely sickly and sensitive, it's probably going to die, as it is turning yellowy-brown and brittle. I have checked the ph, corrected it, as it was only a little too high, so used a tiny bit of cider vinegar diluted in gallon water, and even added expensive cooperas natural iron sulphate, in case it had iron chlorosis, and nothing is helping revive it. mike


On Jun 14, 2009, Eleven from Royal Oak, MI (Zone 6a) wrote:

I bought two of these from a big box store before reading all the other comments but went ahead and planted them thinking I didn't have much to lose. They seemed to be doing all right for a couple weeks and put on some new growth. Then the neighborhood squirrels found them; the poor shrubs were dead within three days. I loved how they looked before that so might try them again next year with some cages for protection.


On Dec 17, 2008, tropicsofohio from Hilliard, OH (Zone 6b) wrote:

wow, im surprized at the negative comments, i didnt realize how easy it is to kill these, i bought one 2 years ago, stuck it in the ground, and ignored it. it bloomed, added growth, and lookes beautiful. the leaves turn purple in the winter. i like this shrub very much. good luck with it


On Dec 17, 2008, esteve59 from Annapolis, MD wrote:

Very cool dwarf, but I also have 2 out of 3 dead....a very picky shrub......


On Aug 14, 2008, plantaholic186 from Winnetka, IL wrote:

I have to say, I have tried this plant several times, and it just won't stay alive. It's planted in raised beds full of azaleas and rhodies that thrive, but I've had only one survive out of 5 this year. Most of my rhodies are z6, so it should be okay. Maybe it just doesn't like me.


On Mar 1, 2004, Todd_Boland from St. John's, NL (Zone 5b) wrote:

Another gem for the rockery, this dwarf rhododendron has flowers very close to blue, a rare colour for rhodododendrons. the foliage is also blue-tinted and fragrant.