Photo by Melody

PlantFiles: Rose Mallow, Annual Mallow
Lavatera trimestris 'Mont Blanc'

Family: Malvaceae (mal-VAY-see-ee) (Info)
Genus: Lavatera (lav-uh-TEER-uh) (Info)
Species: trimestris (try-MES-tris) (Info)
Cultivar: Mont Blanc

3 members have or want this plant for trade.


18-24 in. (45-60 cm)

15-18 in. (38-45 cm)

Not Applicable

Sun Exposure:
Full Sun

Unknown - Tell us

Bloom Color:
White/Near White

Bloom Time:
Mid Summer
Late Summer/Early Fall

Unknown - Tell us

Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; sow indoors before last frost

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds
Allow seedheads to dry on plants; remove and collect seeds

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By Weezingreens
Thumbnail #1 of Lavatera trimestris by Weezingreens

By arsenic
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By poppysue
Thumbnail #3 of Lavatera trimestris by poppysue

By poppysue
Thumbnail #4 of Lavatera trimestris by poppysue

By tcfromky
Thumbnail #5 of Lavatera trimestris by tcfromky

By kennedyh
Thumbnail #6 of Lavatera trimestris by kennedyh

By kennedyh
Thumbnail #7 of Lavatera trimestris by kennedyh

There are a total of 8 photos.
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1 positive
No neutrals
1 negative

Gardeners' Notes:

Negative rebecca101 On Mar 14, 2008, rebecca101 from Madison, WI (Zone 5a) wrote:

This was a disappointment. The plants were growing alright and blooming profusely, although they looked a mess because they were getting eaten to smithereens by Japanese beetles. Then they suddenly all wilted (the entire plant at once) and died. Not sure if it was the plant's fault or mine or just bad luck. They did have nice white blooms for a brief period (only about 2 weeks), but I found the foliage weedy and raggedy looking, the large blooms out of proportion with the dwarf plant, and the white a glaring toothpaste color. All in all not something I would plant in my garden again.

Positive Weezingreens On Sep 3, 2002, Weezingreens from Seward, AK (Zone 3b) wrote:

Mont Blanc is a compact lavatera. The dark green leaves are a complimentary backdrop for the pure white hibiscus-like flowers. These bloom in late summer here in Seward, Alaska.


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

Bellaire, Michigan
Lancaster, Pennsylvania
Mercer, Pennsylvania
Kennewick, Washington
Madison, Wisconsin

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