Horned Pondweed Identification & Treatment
Scientific Name: Zannichellia palustris Category: Submerged Tier: 3 — Localized — Native, low management priority
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Identification
Horned pondweed has very thin, threadlike leaves arranged in opposite pairs or clusters. It gets its common name from the distinctive crescent or horn-shaped seeds. The plant is delicate and often found in shallow water. Key distinguishing features:
- Very thin, threadlike leaves
- Opposite leaf arrangement
- Distinctive horn-shaped (crescent) seeds
- Grows in shallow water, often in dense patches
Commonly confused with: Sago Pondweed (alternate leaves, banana-shaped tubers), Widgeon Grass (similar habitat, different seed shape)
Treatment
Horned pondweed is a native species with wildlife value, particularly for waterfowl. Selective treatment is recommended only when growth is excessive.
- Aquathol K (endothall) — Contact herbicide for spot treatment.
- Navigate (2,4-D) — Selective systemic option.
Full Profile
- Native Range: Cosmopolitan
- US Distribution: Found throughout the United States. USDA Zones 3–10.
- Regulatory Status: Not regulated (native).
- Habitat: Shallow ponds, lakes, and brackish waters. Tolerates slightly saline conditions.
- Reproduction: Seed and vegetative fragmentation.
- Ecological Benefits: Seeds are an important food source for waterfowl, especially dabbling ducks. Provides cover for aquatic invertebrates.
Sources: Texas A&M AquaPlant | USDA PLANTS Database
Related Species
- Sago Pondweed (Stuckenia pectinata) — Submerged, Tier 2
- Southern Naiad (Najas guadalupensis) — Submerged, Tier 2
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