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// SPECIES PROFILE · PERENNIAL · NATIVE

Coarse smartweed

Polygonum robustius

Coarse smartweed (Polygonum robustius) is a perennial in the — family. Native range includes MO — verified against the Lady Bird Johnson Wildflower Center native distribution database. Hardy in zones 3a–11b. Mature size 17"–2'. Blooms Jul–Oct.

// QUICK FACTS
Family
—
Group
perennial
Native range
Native to 16 U.S. states, including CT, FL, IN, KY, MA, MD…
USDA hardiness
Zones 3a–11b
Mature size
17"–2'
Sun
—
Water
—
Bloom
Jul–Oct
Wildlife value
Pollinator and wildlife support
Ecological role
native species profile
Coarse smartweed (Polygonum robustius)
Polygonum robustius — Coarse smartweed. Photo via iNaturalist — (c) Samuel A Schmid, PhD, PWS, some rights reserved (CC BY).

Field Notes

[ growing · ecology · siting · care ]

Coarse smartweed (Polygonum robustius) is a perennial in the — family. Native range includes MO — verified against the Lady Bird Johnson Wildflower Center native distribution database. Hardy in zones 3a–11b. Mature size 17"–2'. Blooms Jul–Oct.

Why it's on this list: native species profile. Native-range data from the Lady Bird Johnson Wildflower Center (NPIN), cross-checked against iNaturalist observations. Part of Rooted Revival's regional native plant catalog — true natives for Oklahoma, Arkansas, Missouri and Kansas.

Companion Planting

[ guild · polyculture · cross-layer pairings ]

In the same native range, coarse smartweed pairs naturally with: Broadleaf Arrowhead (Sagittaria latifolia), Blue-Eyed Grass (Sisyrinchium angustifolium), Butterfly Milkweed (Asclepias tuberosa), Cardinal Flower (Lobelia cardinalis).

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