Quick answer: Stiff greenthread (Thelesperma filifolium) is native to 1 state. What's commonly sold under this name is the true wild species. It's typically seeds, verified 16 Sep 2026.
Photo: Bentham-Moxon Trust.; Curtis, William; Curtis's botanical magazine dedications, 1827-1927 : portraits and biographical n, Wikimedia Commons (PUBLIC DOMAIN)
Where it's native
Listed in the directory as native to these states. Click a state for its full native-plant guide.
Growing conditions
From the Lady Bird Johnson Wildflower Center Native Plant Database.
| Sun | Full sun |
|---|---|
| Water | Low, Dry |
| Soil | Dry, sandy or gravelly |
| Bloom | May-Jul |
| Height | Up to 30 in |
| Wildlife value | Nectar for many butterfly species |
none; deer resistant
Buying it
Sold true to the wild species as of the last check (16 Sep 2026), via Amazon.
Sold as: Seeds via Amazon · listing verified 16 Sep 2026
See where to buy →Quick answers about Stiff greenthread
Where is Stiff greenthread native?
Stiff greenthread (Thelesperma filifolium) is native to Oklahoma. Check your state's page in this directory for the full list of plants native where you live.
When does Stiff greenthread bloom?
Stiff greenthread blooms May-Jul. Exact timing shifts a few weeks with latitude and elevation.
What growing conditions does Stiff greenthread need?
Light: Full sun. Water: Low, Dry. Soil: Dry, sandy or gravelly. Mature height: Up to 30 in.
Is Stiff greenthread good for pollinators and wildlife?
Yes. Wildlife value: Nectar for many butterfly species.
Is Stiff greenthread deer-resistant or drought-tolerant?
Stiff greenthread is drought-tolerant.
Where can I buy real Stiff greenthread seed or plants?
We found a listing sold as seeds that names the true species, last checked 16 Sep 2026. Look for the scientific name Thelesperma filifolium on any listing.
Similar native plants
Native plants that share growing conditions or range with Stiff greenthread.
- Pincushion daisy (perfumeballs) Gaillardia suavis
- Western ironweed Vernonia baldwinii
- Rough coneflower Rudbeckia grandiflora
- Texas bluebonnet (state flower) Lupinus texensis
- Fringed bluestar Amsonia ciliata
- Maximilian sunflower Helianthus maximiliani
Also listed under
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