Photo by Melody

PlantFiles: Hardy Hibiscus, Rose Mallow, Swamp Mallow
Hibiscus moscheutos 'Blue River II'

Family: Malvaceae (mal-VAY-see-ee) (Info)
Genus: Hibiscus (hi-BIS-kus) (Info)
Species: moscheutos (mos-KEW-tos) (Info)
Cultivar: Blue River II

» View all varieties of Hibiscus

4 vendors have this plant for sale.

11 members have or want this plant for trade.

6-8 ft. (1.8-2.4 m)

36-48 in. (90-120 cm)

USDA Zone 5a: to -28.8 C (-20 F)
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)

Sun Exposure:
Full Sun

Bloom Color:
White/Near White

Bloom Time:
Mid Summer
Late Summer/Early Fall

Unknown - Tell us

Other details:
Requires consistently moist soil; do not let dry out between waterings

Soil pH requirements:
7.6 to 7.8 (mildly alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds

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By Eclipse
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By jackieshar
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There are a total of 9 photos.
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3 positives
1 neutral
No negatives

Gardeners' Notes:

Neutral Fires_in_motion On Jun 30, 2014, Fires_in_motion from Vacherie, LA (Zone 9a) wrote:

Huge, spectacular white flowers, but prone to (seemingly constant) fungal leaf-spotting. Seems weird that a swamp plant would develop fungal problems from too much water... Mine completely died, or so I thought, after the Icepocalypse of 2014. (I live in southeast Louisiana; the temp. got down to about 19.) But now, in early summer, it has sprouted back. I can't say I'm too thrilled about it, but we'll see if it does better this time around. I also found one adorable little seedling a few feet away from it.

Positive vossner On Sep 14, 2007, vossner from Richmond, TX (Zone 9a) wrote:

I like it! bought two on ebay as 4" plants this spring. They are close to 2 ft tall and have had a few blooms. Beautiful, big, all white, and delicate. I look forward to future years when it becomes a fuller plant. Mine are inground, 6-7 hrs of sun.

July 2008. My plants died to the ground but came back in early spring. Shrubs are presently about 4' x 4' and some of the flowers are about 9" in diameter. What a spectacular hardy hibiscus! I read it likes moist environment, but mine is not planted in a particularly wet area. This plant gets A+

June 2014: dead. I think excessive watering

Positive rose_mallow On Nov 9, 2005, rose_mallow from Randolph, MA (Zone 5a) wrote:

When I bought this plant it was dying/liquidated for $3. Hardy hibiscus was unknown to me, all I know is the picture on the container looked beautiful - I put it on the ground beginning of Fall 2004. Summer 2005 I couldn't be outside in the garden - every single passerby wanted to know what it was. "never seen anything like it..." me neither. I had no choice in August to move it I saw that it could be divided - I divided it - I have 3 of them now, plus seeds for Summer 2006.
Even after division they were blooming and seeding.

Positive jackieshar On Sep 19, 2005, jackieshar from Texas/Okla central border
United States (Zone 7b) wrote:

saucer sized blooms, beautiful pure white.......likes a little moisture in the soil..handles the heat well with a bit of afternoon sun.....blooms now and again thru spring, summer and fall..hardy with a bit of mulch


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

Merritt Island, Florida
Orange Park, Florida
Clarkesville, Georgia
Commerce, Georgia
Marietta, Georgia
Chicago, Illinois
La Grange, Illinois
Plainfield, Illinois
Roscoe, Illinois
Farmersburg, Indiana
Greenville, Indiana
Indianapolis, Indiana
Shawnee Mission, Kansas
Cumberland, Maryland
Randolph, Massachusetts
Battle Creek, Michigan
Mason, Michigan
Cleveland, Mississippi
Franklin, North Carolina
Thackerville, Oklahoma
Bethlehem, Pennsylvania
West Chester, Pennsylvania
North Augusta, South Carolina
Knoxville, Tennessee
Brenham, Texas
Fate, Texas
Liberty Hill, Texas
Richmond, Texas
Temple, Texas
Chesapeake, Virginia
Seattle, Washington

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