Spanish Needles (Bidens bipinnata)

Spanish Needles

Bidens bipinnata

It carries tiny hooked seeds that hitch a ride on passersby, a clever survival story. Annual herbaceous wildflower; common names: Spanish Needles, Beggar's Tick.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerates dry, poor soil conditions without stunted growth
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Watering Water deeply when top 2–3 cm of soil is dry; drought-tolerant once established
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Temperature Thrives in warm temperate to subtropical temperatures; tolerates light frost as young seedlings
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Characteristics

  • Leaf: Bipinnately compound, lanceolate leaflets with serrated margins; bright green.
  • Flower: Small daisy-like heads with yellow ray florets and yellow disc florets; clustered at stem tips.
  • Stem: Erect, branching, slightly hairy; green to reddish-brown.
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Care Guide

Watering

Keep soil slightly moist during active growth; avoid overwatering to prevent root rot

Fertilization

Optional diluted feed once monthly. Avoid high-nitrogen fertilizers to prevent excessive foliage growth at the expense of flowering

Composted banana peel tea:Soak fully composted banana peels in water for 24 hours; dilute 1:20 for root drench; discard solids to avoid odor and pest attraction
Pruning
  • Deadhead spent flowers to encourage extended blooming through early autumn
  • Thin overcrowded stems to improve airflow and reduce fungal disease risk
  • Cut back entire plant to ground level after flowering to allow self-seeding for next season
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats

Humans: No known toxic effects to humans

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Garden Uses & Culture

Culture: N/A

Usage: Wildflower for pollinator gardens; traditional medicinal use for minor skin irritations and digestive support