Stiff Greenthread
Thelesperma filifoliumnative · Hill Country
Stiff Greenthread is an annual wildflower native to the Texas Hill Country that grows 1–2 ft tall and 2 ft wide. It wants full sun and low water. Blooms yellow in May–Jul. Deer rarely browse it. Good for birds, butterflies and nectar insects.
Will it grow in your yard?
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The facts
4 sources- Type
- Annual wildflower
- Sun
- Full sun (6–8 hrs of direct sun)
- Water
- Low
- Height
- 1–2 ft
- Spread
- 2 ft
- Bloom
- May–Jul · yellow
- Foliage
- Deciduous or dies back in winter
- Soil
- Recorded on calcareous, dry, gravelly, sand
- Deer
- High — deer rarely browse it
- Wildlife
- Supports birds, butterflies and nectar insects
Where it grows
Recorded in these EPA Level IV ecoregions in the Austin and Hill Country launch area:
Balcones CanyonlandsLlano UpliftEdwards Plateau WoodlandNorthern Blackland PrairieSouthern Post Oak SavannaFloodplains and Low TerracesLimestone Cut PlainSan Antonio Prairie
3,449 occurrence records in Central Texas (GBIF).
Can you buy it?
Also grows here — hard to find. Native and recorded growing in Central Texas, but not on the grower stock lists we read. Sourcing varies: some are stocked widely, others you will have to hunt for.