Gardening
in Tucson, Phoenix,
Arizona and California

Gardening in Tucson, Phoenix, Arizona and California

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Thymophylla pentachaeta: Fiveneedle Pricklyleaf / Golden Dyssodia

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Description
Form: Herb.
Lifespan: Perennial.
Leaf retention: Evergreen except dies to ground in hard freezes.
Growth rate: Moderate.
Mature Size: 6-10" high and somewhat wider.
Flowers: One-half inch wide, at ends of stalks, yellow rays with orange center.
Bloom: A repeat bloomer all year in regions without freezes.
Fruit: Seed.
Leaves: Green, lacy, thread-like, soft spiny tips. Foul aroma if crushed.
Stems: No thorns.
Wildlife: Attracts butterflies and other insects. Caterpillar food plant for Dainty Sulphur butterfly. Avoided by mammals.
Toxic / Danger: No toxicity reported.
Origin: California through Texas, Nevada, Utah, Mexico.

Cultivation and Uses
USDA hardiness zones: 7-10.
Heat tolerant: Yes.
Drought tolerant: Yes.
Sun: Full sun.
Water once established: Twice a month. Supplemental water improves performance, but soil must dry out between waterings. Subject to root rot if overwatered.
Soil: Well drained, dry, low in organic content, pH 6.6-8.5 (neutral to alkaline).
Prune: After freezing temperatures, remove dead stems or cut nearly to ground. Recovers quickly in warm temperatures.
Mulch: Small gravel may extend drought tolerance. Mulch is undesirable with frequent water or rain.
Litter: No, except for freeze damage.
Propagation: Freely reseeds. Will eventually cover a wide area.
Uses: Ornamental groundcover.

Comments
Former scientific name is Dyssodia pentachaeta. Another common name is Dogweed. This plant is rabbit-proof and provides attractive winter color in zones 9-10. The butterfly is a Checkered White.



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Thymophylla pentachaeta: Fiveneedle Pricklyleaf / Golden Dyssodia - flowers

Thymophylla pentachaeta: Fiveneedle Pricklyleaf / Golden Dyssodia - with butterfly

Thymophylla pentachaeta: Fiveneedle Pricklyleaf / Golden Dyssodia