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Marsh Dewflower

Murdannia keisak

Last reviewed: August 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)

Toxicity unknown

Marsh Dewflower (Murdannia keisak) 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

high

Size

4"–12" H × 2"–6" W

Bloom

Jul, Aug, Sep

Pollinators

bees, flies

Native alternatives to Marsh Dewflower

Marsh Dewflower is not native to the United States. These natives fill a similar role in a planting, matched on bloom season, bloom color and mature size.

Before you buy

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Wondering what could grow where Marsh Dewflower is now? Upload a photo of the spot and Patch Vision shows a rendering of it replanted with natives for your region.

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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.

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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.
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.

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

These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.

See all plant problem guides

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