Form: Clump-forming herb.
Leaf retention: Evergreen but dies to ground in hard
Growth rate: Moderate.
Mature Size: 1' high and 3-5' wide.
Flowers: Daisy-like, yellow rays having squared
tips with two notches, yellow to orange center, at terminal
end of stem, fragrant.
Bloom: Sporadically, all year in regions without freezes.
Fruit: Hairy seed within dried flower head.
Leaves: Green, linear, surrounding base of plant,
unpleasant odor when crushed.
Stems: No thorns. Unbranched, leafless flower stems.
Roots: Taproot makes transplanting difficult.
Wildlife: Attracts insects, sometimes butterflies.
Rabbit and deer resistant.
Toxic / Danger: No.
Origin: Alberta, Saskatchewan, western United States minus
Washington and Oregon, into Mexico.
Cultivation and Uses
USDA hardiness zones: 5b-10.
Heat tolerant: Yes.
Drought tolerant: Yes.
Sun: Full sun.
Water after becoming established: Monthly. Accepts
frequent watering in very well drained soil but root
rot can occur if soil stays moist.
Soil: Well drained, dry, low in organic content,
pH 6.1-7.8 (slightly acidic to slightly alkaline).
Mulch: Not necessary and may be detrimental when soil
subjected to frequent watering. Best when inorganic.
Prune: Remove spent flower heads to improve appearance.
Propagation: Seed. Plant reseeds in landscape.
Uses: Ornamental, xeric garden.
Former scientific name: Hymenoxys acaulis. Five subspecies are
recognized. The plant genus, Tetraneuris, is sometimes referred
to as Bitterweed. Another common name is Perky Sue.
The name stemless refers to the lack of a stem between the root
crown and the leaves. The butterfly is a Fatal Metalmark.
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