Water Stargrass Identification & Treatment
Scientific Name: Heteranthera dubia Category: Submerged Tier: 3 — Localized — Native, beneficial species
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Identification
Water stargrass has narrow, grass-like leaves (2–5 inches long) and produces small, star-shaped yellow flowers at the water surface. Stems are slender, branching, and grow from rooted bases in sediment. Key distinguishing features:
- Narrow, grass-like leaves alternately arranged
- Small yellow star-shaped flowers at the surface
- Slender branching stems
- Rooted in sediment
Commonly confused with: Sago Pondweed (similar narrow leaves but no yellow flowers), Vallisneria (much longer ribbon-like leaves from basal rosette)
Treatment
Water stargrass is a native species with good habitat value. Spot treatment is recommended only when overgrowth impairs pond use.
- Aquathol K (endothall) — Contact herbicide for spot treatment.
- Navigate (2,4-D) — Selective systemic option.
Full Profile
- Native Range: North America
- US Distribution: Eastern and central United States. USDA Zones 4–9.
- Regulatory Status: Not regulated (native).
- Habitat: Ponds, lakes, and slow streams with moderate water clarity.
- Reproduction: Fragmentation and seed.
- Ecological Benefits: Good habitat plant for fish and invertebrates. Provides food for waterfowl.
Sources: Texas A&M AquaPlant | USDA PLANTS Database
Related Species
- Sago Pondweed (Stuckenia pectinata) — Submerged, Tier 2
- Vallisneria (Tape Grass) (Vallisneria americana) — Submerged, Tier 3
- Elodea (Elodea canadensis) — Submerged, Tier 1
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