North America Native Plant

Damasonium

Botanical name: Damasonium

USDA symbol: DAMAS

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Damasonium: A Hidden Gem for Your Water Garden If you’re looking to add something truly unique to your water garden or pond, let me introduce you to damasonium – a charming native aquatic plant that might just become your new favorite. This little-known perennial forb brings both beauty and ecological ...

Damasonium: A Hidden Gem for Your Water Garden

If you’re looking to add something truly unique to your water garden or pond, let me introduce you to damasonium – a charming native aquatic plant that might just become your new favorite. This little-known perennial forb brings both beauty and ecological value to wet areas, making it a perfect choice for gardeners who want to create authentic native water features.

What Exactly Is Damasonium?

Damasonium is a native North American aquatic plant that belongs to the water plantain family. As a perennial forb, it’s an herbaceous plant without any woody stems, but don’t let that fool you into thinking it’s delicate. This hardy little plant has adapted beautifully to life in and around water, creating lovely displays year after year.

What makes damasonium truly special is its distinctive star-shaped fruits that follow its delicate white flowers – earning it the nickname starfruit in some circles. It’s like having tiny botanical stars floating in your water garden!

Where Does Damasonium Call Home?

This native beauty naturally occurs across several western states, including California, Idaho, Nevada, Oregon, and Washington. Throughout these regions, you’ll find it thriving in shallow water areas, pond margins, and seasonally wet spots.

Why Consider Adding Damasonium to Your Garden?

Here are some compelling reasons why this native water plant deserves a spot in your landscape:

  • True native authenticity: Supporting local ecosystems by choosing plants that naturally belong in your region
  • Unique visual interest: Those star-shaped fruits are genuine conversation starters
  • Pollinator support: The white flowers attract beneficial insects to your water garden
  • Low maintenance: Once established in suitable conditions, it largely takes care of itself
  • Wetland restoration: Perfect for naturalized pond edges and bog gardens

Perfect Growing Conditions

Damasonium thrives in USDA hardiness zones 7-10, making it suitable for much of the western United States where it naturally occurs. Here’s what this water-loving plant needs to flourish:

  • Water requirements: Shallow water or consistently saturated soil
  • Light needs: Full sun to partial shade
  • Soil preferences: Muddy, organic-rich substrates
  • Depth: Plant in water depths of 2-6 inches, or in bog-like conditions

Planting and Care Tips

Getting damasonium established is surprisingly straightforward if you can provide the right wet conditions:

  • Timing: Plant in spring after the last frost when water temperatures begin to warm
  • Location: Choose pond margins, shallow water areas, or create a bog garden
  • Planting depth: Place in 2-6 inches of water or in permanently saturated soil
  • Maintenance: Very minimal once established – simply remove any dead foliage in fall
  • Winter care: In colder zones, the plant will die back and return from rootstock in spring

Garden Design Ideas

Damasonium works beautifully in several landscape settings:

  • Water gardens: Plant along shallow edges of ponds or water features
  • Bog gardens: Perfect for constructed wetland areas
  • Native plant gardens: Include in authentic regional plant communities
  • Rain gardens: Use in areas that collect seasonal water
  • Naturalized pond margins: Let it spread naturally for a wild, authentic look

Is Damasonium Right for Your Garden?

This native water plant is ideal if you have or are planning to create wet areas in your landscape. It’s particularly perfect for gardeners who want to support native ecosystems while adding unique visual elements to their water features.

However, damasonium might not be the right choice if you don’t have suitable wet conditions, as it absolutely requires consistent moisture or shallow water to thrive. It’s also worth noting that as a specialized aquatic plant, it won’t work in traditional garden beds or containers unless you can maintain water garden conditions.

For western gardeners with ponds, bog gardens, or wet areas, damasonium offers a wonderful opportunity to grow something truly special – a native plant that brings both ecological value and distinctive beauty to your water garden landscape.

Damasonium

Classification

Group

Monocot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Liliopsida - Monocotyledons

Subclass

Alismatidae

Order

Alismatales

Family

Alismataceae Vent. - Water-plantain family

Genus

Damasonium Hill - damasonium

Species

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA