Photo by Melody

PlantFiles: Glade Mallow
Napaea dioica

Family: Malvaceae (mal-VAY-see-ee) (Info)
Genus: Napaea (na-PAY-uh) (Info)
Species: dioica (dy-oh-EE-kuh) (Info)

One vendor has this plant for sale.


4-6 ft. (1.2-1.8 m)

12-15 in. (30-38 cm)
15-18 in. (38-45 cm)
18-24 in. (45-60 cm)

USDA Zone 3a: to -39.9 C (-40 F)
USDA Zone 3b: to -37.2 C (-35 F)
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)
USDA Zone 10a: to -1.1 C (30 F)

Sun Exposure:
Full Sun
Sun to Partial Shade

Unknown - Tell us

Bloom Color:
White/Near White

Bloom Time:
Mid Summer
Late Summer/Early Fall


Other details:
Average Water Needs; Water regularly; do not overwater
Requires consistently moist soil; do not let dry out between waterings

Soil pH requirements:
Unknown - Tell us

Patent Information:

Propagation Methods:
Unknown - Tell us

Seed Collecting:
Unknown - Tell us

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By scirpidiella
Thumbnail #1 of Napaea dioica by scirpidiella

By scirpidiella
Thumbnail #2 of Napaea dioica by scirpidiella

By scirpidiella
Thumbnail #3 of Napaea dioica by scirpidiella

By scirpidiella
Thumbnail #4 of Napaea dioica by scirpidiella


3 positives
1 neutral
No negatives

Gardeners' Notes:

Positive Dean48089 On Jun 6, 2013, Dean48089 from Warren, MI (Zone 6b) wrote:

This is a plant that I think should be used more, especially by those gardeners looking for a 'tropical' effect. Yes, it's a Midwest native, but the large leaves and lush growth of the plant make it seem more like something from the Amazon.

The description above lists the height at six feet, but this refers to the flower stalks. My plant is quite mature, I've had it for 13 years, and it gets four feet tall by four to five feet wide. The tiny little white mallow flowers are at the tops of tall stems; I usually remove the flowering stem when it appears as the flowers aren't particularly attractive and I see no point in having the plant expend energy on unwanted flowers.

I strongly disagree with the part about keeping this plant constantly moist. Mine grows in a standard garden setting and gets only rainfall for water, which during a Michigan summer often means little or none in August. My glade mallow never shows signs of wilting even when it gets dry.

Glade mallow makes a large taproot and so should be planted in its final spot. If you're not sure where you want it, leave the plant in its pot and move it around rather than planting it and then moving it. Also, because of that taproot resist any requests to divide what appears to be a clump. All the growth is coming off that large root and so you will must likely end up killing the whole plant. If you want more, let your plant set seeds and raise up the seedlings.

Positive scirpidiella On Sep 8, 2009, scirpidiella from Pińczw
Poland (Zone 6b) wrote:

I cultivate this species from seeds. Plants are full frost hardy in Poland (zone 6). My plants grow in light shade on sandy soil.

Positive pastime On Jul 9, 2008, pastime from Waterman, IL (Zone 5a) wrote:

Planted it several years ago, but lost the tag. Plant was idenified this year for me by Ken Robertson of the Illinois Natural HIstory Society at the University of IL. It's growing well in full sun, gravely soil (old driveway), but I do water it.

Napaea dioica is dioecious (male and female plants), diploid. It was introduced by John Clayton in his Flora Virginica and taken up by Karl von Linne (Linnaeus) in his Species Plantarum. As the starting point for nomenclatural priority is the Species Plantarum, authorship is conventionally ascribed to Linnaeus.

It's found in the wild in WI, IL, VA, VT, and parts of PA. It is on the endangered list in Minnesota.

Neutral Lady_fern On May 28, 2007, Lady_fern from Jeffersonville, IN (Zone 6a) wrote:

The main attraction is the large leaves. They are very structural in the shade garden where most plants are smaller. This plant even thrives under a walnut tree with no apparent ill effects!


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

Waterman, Illinois
Jeffersonville, Indiana
Warren, Michigan

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