10 Seeds Stiff Greenthread Thelesperma filifolium Native Wildflower

Stiff Greenthread (Thelesperma filifolium) is a native perennial wildflower known for its fine, thread-like foliage and cheerful yellow blooms that appear atop slender stems through the warm months. Its airy texture and long flowering window make it an appealing choice for meadow plantings, pollinator gardens, and low-water landscapes where a naturalistic look is desired.

This easy-going species works well in mixed wildflower beds, prairie-style borders, and container plantings, where its delicate foliage contrasts nicely with broader-leaved companions. The bright daisy-like flowers provide season-long color and integrate smoothly into informal and xeriscape designs. It prefers full sun and well-drained soils, tolerates heat and dry conditions once established, and returns reliably in suitable climates.
Species: Thelesperma filifolium
Type: Perennial wildflower
Plant_Habit: Upright, clump-forming
Sun: Full sun
Soil: Well-drained, sandy to loamy
Zones: 5-9
Germination: 14-30 days at 65-70F
Sowing: Surface sow, lightly press into soil
Spacing: 12-18 inches
Notes: Low water needs once established