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PlantFiles: Palm-leaf Marshmallow, Hemp-leaved Hollyhock
Althaea cannabina

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Family: Malvaceae (mal-VAY-see-ee) (Info)
Genus: Althaea (AL-thay-uh) (Info)
Species: cannabina (kan-na-BIN-uh) (Info)

One vendor has this plant for sale.

7 members have or want this plant for trade.

Category:
Perennials

Height:
36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)

Spacing:
18-24 in. (45-60 cm)

Hardiness:
USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
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)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Sun to Partial Shade

Danger:
N/A

Bloom Color:
Pink
White/Near White

Bloom Time:
Mid Summer
Late Summer/Early Fall

Foliage:
Herbaceous
Velvet/Fuzzy-Textured

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:
Non-patented

Propagation Methods:
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors
From seed; sow indoors before last frost

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds
Properly cleaned, seed can be successfully stored

Click thumbnail
to view:

By balvenie
Thumbnail #1 of Althaea cannabina by balvenie

By balvenie
Thumbnail #2 of Althaea cannabina by balvenie

By KashtanGeorge
Thumbnail #3 of Althaea cannabina by KashtanGeorge

Profile:

1 positive
No neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive coriaceous On Dec 20, 2014, coriaceous from ROSLINDALE, MA wrote:

I have only observed this in the new Piet Oudolf border at the New York Botanic Garden, but I was impressed by its slender refinement.

Both flowers and foliage are small and elegant, on a big shrub-sized plant. The stems are slender and wiry but strong, and support the leaves and flowers almost invisibly. The whole plant has a see-through quality, and I suspect it would look good as a scrim plant toward the front of a deep mixed border.

The flowers are self-cleaning, and the foliage is clean and unblemished. As the name suggests, the leaves do look a bit like cannabis.

I'm eager to try using this in a garden.

Regional...

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

Lancaster, Massachusetts
Bronx, New York
Austin, Texas
Marysville, Washington



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