Glade Mallow

Napaea dioica

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



Water Requirements:

Average Water Needs; Water regularly; do not overwater

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

Sun Exposure:

Full Sun

Sun to Partial Shade



Foliage Color:

Unknown - Tell us


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)

Where to Grow:

Grow outdoors year-round in hardiness zone



Bloom Color:

White/Near White

Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Flowers are fragrant

Bloom Size:

Unknown - Tell us

Bloom Time:

Mid Summer

Late Summer/Early Fall

Other details:

Unknown - Tell us

Soil pH requirements:

Unknown - Tell us

Patent Information:


Propagation Methods:

By dividing the rootball

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds

Properly cleaned, seed can be successfully stored


This plant is said to grow outdoors in the following regions:

Waterman, Illinois

Jeffersonville, Indiana

Warren, Michigan

Gardeners' Notes:


On Dec 31, 2015, coriaceous from ROSLINDALE, MA wrote:

This big, easily cultivated perennial has big bold foliage that's valuable for adding structure to a planting. The basal leaves are up to 18" long and wide, held on long petioles. Few perennials hardy in Z6a where I garden have such showy bold tropical-esque leaves, and of those most are bog plants. Out of bloom, it looks a bit like a ligularia. This makes a great change from the ubiquitous hostas, where the soil is moist.

It likes consistently moist soil but is less demanding of moisture than the usual cast of characters: Rodgersia, Rheum palmatum, Petasites, Darmera peltata, etc.

I agree that the flowers are not especially ornamental. The flowering stems can be cut out as they appear, leaving the more ornamental basal foliage.

This is a mons... read more


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 i... read more


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.


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.


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!