Smartweed Identification & Treatment
Scientific Name: Persicaria spp. (formerly Polygonum) Category: Emergent Tier: 3 — Localized — Limited geographic range or lower frequency
← Back to Plant Identification Guide | Product Cross-Reference | Ecoregion Guide
Identification
Smartweeds have alternate, lance-shaped leaves with distinctive papery sheaths (ocreae) at each node. Small flowers in dense spikes are typically pink or white. Several species grow in and around water. Key distinguishing features:
- Papery sheath at each stem node (ocrea)
- Dense pink or white flower spikes
- Jointed, sometimes swollen stems
- Variable growth forms — some erect, some trailing
Treatment
- Glyphosate 5.4 — Systemic herbicide for emergent/shoreline growth.
- Clearcast (imazamox) — Systemic option near water.
Full Profile
- Native Range: Most species native to North America
- US Distribution: All 48 contiguous states. Ubiquitous in wet areas.
- Regulatory Status: Not regulated (native species).
- Habitat: Pond margins, wet meadows, ditches, shorelines.
- Ecological Benefits: Seeds are an important waterfowl and wildlife food source. Many native smartweed species are valuable components of wetland plant communities.
Sources: Texas A&M AquaPlant – Smartweed | USDA PLANTS Database
Related Species
- Cattails (Typha latifolia (broadleaf), T. angustifolia (narrowleaf), T. × glauca (hybrid)) — Emergent, Tier 1
- Phragmites (Common Reed) (Phragmites australis subsp. australis (invasive) vs. P. australis subsp. americanus (native)) — Emergent, Tier 1
- Creeping Water Primrose (Ludwigia spp. (L. peploides, L. grandiflora, L. repens)) — Emergent, Tier 1
- Dollar Weed (Pennywort) (Hydrocotyle spp. (H. umbellata, H. ranunculoides, H. verticillata)) — Emergent, Tier 2
- Alligator Weed (Alternanthera philoxeroides) — Emergent, Tier 2
- Flowering Rush (Butomus umbellatus) — Emergent, Tier 3
← Back to Plant Identification Guide | Product Cross-Reference | Beneficial Considerations
Natural Waterscapes — Expert Aquatic Plant Identification & Treatment Need help identifying a plant? Send us a photo and our experts will identify it for you.