// SPECIES PROFILE · ANNUAL · NATIVE

Stiff greenthread

Thelesperma filifolium var. intermedium

Stiff greenthread (Thelesperma filifolium var. intermedium) is a annual in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 2a–10a. Mature size 1"–30". Blooms May–Jul.

// QUICK FACTS

Family: —
Group: annual
Native range: Native to 12 U.S. states, including AR, CO, KS, LA, MO, MS…
USDA hardiness: Zones 2a–10a
Mature size: 1"–30"
Sun: Full sun
Water: Low · xeric
Bloom: May–Jul
Wildlife value: Pollinator and wildlife support
Ecological role: native species profile

Stiff greenthread (Thelesperma filifolium var. intermedium) — *Thelesperma filifolium var. intermedium* — Stiff greenthread. Photo via iNaturalist — (c) Laura Gaudette, some rights reserved (CC BY).

Field Notes

[ growing · ecology · siting · care ]

Stiff greenthread (Thelesperma filifolium var. intermedium) is a annual in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 2a–10a. Mature size 1"–30". Blooms May–Jul. Low water use makes it a strong candidate for xeric and drought-conscious plantings.

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, stiff greenthread pairs naturally with: Black-Eyed Susan (Rudbeckia hirta), Common Sunflower (Helianthus annuus), Plains Coreopsis (Coreopsis tinctoria), Louisiana devil's-claw (Proboscidea louisianica).