// SPECIES PROFILE · GRASS · NATIVE

Blackseed speargrass

Piptochaetium avenaceum

Blackseed speargrass (Piptochaetium avenaceum) is a grass in the — family. Native range includes AR, MO, OK. Hardy in zones 3a–11b. Mature size 1"–40". Blooms Apr–Jun.

// QUICK FACTS

Family: —
Group: grass
Native range: Native to 27 U.S. states, including AL, AR, CT, DC, DE, FL…
USDA hardiness: Zones 3a–11b
Mature size: 1"–40"
Sun: —
Water: —
Bloom: Apr–Jun
Wildlife value: Pollinator and wildlife support
Ecological role: native species profile

Blackseed speargrass (Piptochaetium avenaceum) — *Piptochaetium avenaceum* — Blackseed speargrass. Photo by Zihao Wang via Wikimedia Commons (CC BY 4.0).

Field Notes

[ growing · ecology · siting · care ]

Blackseed speargrass (Piptochaetium avenaceum) is a grass in the — family. Native range includes AR, MO, OK. Hardy in zones 3a–11b. Mature size 1"–40". Blooms Apr–Jun.

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, blackseed speargrass pairs naturally with: Big Bluestem (Andropogon gerardii), Common Rush (Juncus effusus), Eastern Gamagrass (Tripsacum dactyloides), Eastern Woodland Sedge (Carex blanda).