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Marsh Dewflower

Murdannia keisak

Last reviewed: June 2026

Marsh Dewflower (Murdannia keisak)
Photo: Milo Pyne. USDA SCS. 1991. Southern wetland flora: Field office guide to plant species. South National Technical Center, Fort Worth. Provided by USDA NRCS Wetland Science Institute (WSI). / Wikimedia Commons (Public domain)

Light

part sun

Water

high

Size

4"–12" H × 2"–6" W

Bloom

Jul, Aug, Sep

Native to

AL, AR, DE, FL and 11 more states

Pollinators

bees, flies

Before you buy

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Browse plants for this ecoregion

South Central Plains

Marsh dewflower is a low-growing annual wildflower that thrives in wet areas and partial sun. It produces small flowers from summer through early fall and spreads modestly in suitable conditions.

In an HOA neighborhood

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

Works well in: backyard only.

  • Has weedy appearance and growth habit
  • Annual nature means gaps in coverage
  • Requires consistently wet conditions

Wildlife value

This plant attracts bees and flies during its summer to fall blooming period, providing nectar for these pollinators.

Common questions

How much sun does Marsh Dewflower need?
Marsh Dewflower grows best in part sun conditions.
When does Marsh Dewflower bloom?
Marsh Dewflower blooms in July, August, and September.
Where is Marsh Dewflower native?
Marsh Dewflower (Murdannia keisak) is native to AL, AR, DE, FL and 11 more states, per the USDA PLANTS Database and regional native plant society lists.
What pollinators does Marsh Dewflower attract?
Marsh Dewflower draws bees and flies.
Is Marsh Dewflower HOA-friendly?
Marsh Dewflower takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

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