How tall does Glade-mallow grow?

Napaea dioica is a robust herbaceous forb that can reach 4 to 8 feet tall in a single growing season when soil moisture is adequate.

What growing conditions does Napaea dioica prefer?

This plant grows best with part sun and medium to consistently moist soil, and it is often found along stream banks, floodplains and low meadow edges.

When does Glade-mallow bloom?

Glade-mallow typically flowers from June through August, sending up tall stalks topped with small white blossoms.

What pollinators visit Napaea dioica flowers?

Bees and beetles are the main visitors to Glade-mallow flowers, moving between the separate male and female plants since the species is dioecious.

Does Glade-mallow tolerate dry conditions?

It prefers medium to consistently moist soil and does not perform well in prolonged drought, so supplemental water helps it thrive in drier garden settings.

Is Glade-mallow HOA-friendly?

Glade-mallow takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

Glade-mallow

Name: Pollinator Patch
Author: Pollinator Patch

Napaea dioica

Last reviewed: August 2026

Glade-mallow (Napaea dioica) is a tall perennial forb that blooms with white flowers from June through August, favoring moist bottomlands, floodplains and streambanks across the Midwest and parts of the Northeast.

Toxicity unknown

Glade-mallow (Napaea dioica) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.

Light

part sun

Water

medium

Size

36"–72" H × 24"–36" W

Bloom

Jun, Jul, Aug

Native to

IA, IL, IN, MD and 4 more states

Pollinators

bees, beetles

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Browse plants for this ecoregion

Driftless Area Southeastern Wisconsin Till Plains Central Corn Belt Plains Eastern Corn Belt Plains

Glade-mallow is a tall native perennial with white clustered flowers that bloom through summer. This robust plant forms upright clumps and thrives in partial sun with moderate moisture. It works well as a background plant in native gardens and naturalized areas.

Growing Glade-mallow

Grow Glade-mallow in part sun and medium water. Mature plants reach 36 to 72 inches tall and spread 24 to 36 inches wide. Expect low maintenance to keep it looking intentional in a front yard.

In an HOA neighborhood

Glade-mallow takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.

Works well in: backyard only.

Very tall growth creates informal appearance
Can look sparse or weedy when not in bloom
May appear too wild for formal landscapes

Wildlife value

The white summer flowers attract various bees and beetles for nectar and pollen. Its sturdy structure provides habitat for beneficial insects throughout the growing season.

Common questions

How tall does Glade-mallow grow?: Napaea dioica is a robust herbaceous forb that can reach 4 to 8 feet tall in a single growing season when soil moisture is adequate.
What growing conditions does Napaea dioica prefer?: This plant grows best with part sun and medium to consistently moist soil, and it is often found along stream banks, floodplains and low meadow edges.
When does Glade-mallow bloom?: Glade-mallow typically flowers from June through August, sending up tall stalks topped with small white blossoms.
What pollinators visit Napaea dioica flowers?: Bees and beetles are the main visitors to Glade-mallow flowers, moving between the separate male and female plants since the species is dioecious.
Does Glade-mallow tolerate dry conditions?: It prefers medium to consistently moist soil and does not perform well in prolonged drought, so supplemental water helps it thrive in drier garden settings.
Is Glade-mallow HOA-friendly?: Glade-mallow takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.

Native range data from the World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

If something looks wrong

Common plant problems, and what to check first

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