Photo by Melody

PlantFiles: Native White Rosemallow
Hibiscus arnottianus

Family: Malvaceae (mal-VAY-see-ee) (Info)
Genus: Hibiscus (hi-BIS-kus) (Info)
Species: arnottianus (ar-not-ee-AH-nus) (Info)

» View all varieties of Hibiscus

4 members have or want this plant for trade.

8-10 ft. (2.4-3 m)
10-12 ft. (3-3.6 m)
12-15 ft. (3.6-4.7 m)
15-20 ft. (4.7-6 m)

4-6 ft. (1.2-1.8 m)

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)
USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:
Full Sun

Bloom Color:
White/Near White

Bloom Time:
Blooms repeatedly


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

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:

Propagation Methods:
From herbaceous stem cuttings
From woody stem cuttings
From softwood cuttings
From semi-hardwood cuttings
From hardwood cuttings
By grafting

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds

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By kennedyh
Thumbnail #1 of Hibiscus arnottianus by kennedyh

By EricInSF
Thumbnail #2 of Hibiscus arnottianus by EricInSF

By einaudi
Thumbnail #3 of Hibiscus arnottianus by einaudi

By einaudi
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Thumbnail #7 of Hibiscus arnottianus by Metrosideros

There are a total of 8 photos.
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2 positives
1 neutral
No negatives

Gardeners' Notes:

Positive debylutz On Jan 27, 2015, debylutz from San Diego, CA (Zone 10a) wrote:

I bought a start of this hibiscus from a mail-order nursery whose name I no longer remember. In ten years, it has grown to a tree-like 20' tall and wide. From early spring to mid-fall, it blooms profusely with beautiful red-stamened white hibiscus flowers. Hummingbirds love it. It tolerates drought, has few pests (maybe aphids), but does not like frost. Almost perfect, if a bit large, for my tropicalesque coastal San Diego garden.

Positive harryharry On Oct 18, 2012, harryharry from Athens
Greece (Zone 9b) wrote:

Growing it for the first year. A very beautiful Hibiscus.

Neutral TruHawaiiNative On Aug 11, 2002, TruHawaiiNative wrote:

There are many different varieties of Hibiscus arnottianus some varieties have larger blossoms some varieties have smaller foliage. All of them have white fragrant flowers the stamens are red and in some species yellow pollen is visible, if not then pollen is red.
The native Hawaiians called this plant koki'o ke'o ke'o
(co key oh kay oh kay oh). Hibiscus arnottianus sometimes hybridizes with Hibiscus waimeae (koki'o kea)


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

Camarillo, California
Palm Springs, California
San Diego, California (2 reports)
Hana, Hawaii
Honolulu, Hawaii
Kurtistown, Hawaii

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