Yellow Lupin (Lupinus luteus)

Yellow Lupin

Lupinus luteus

Bright yellow spikes light up meadows with sunny warmth. Annual herbaceous flowering plant; common name: yellow lupine.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial sun; thrives in open, sunny meadows and tolerates light shade in hot climates
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Watering Water deeply when the top 2–3 cm of soil is dry; avoid overwatering to prevent root rot in heavy soils
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Temperature Thrives in cool temperate conditions; avoid prolonged heat above 28°C which may reduce flowering
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Characteristics

  • Leaf: Palmate compound leaves with 5–9 soft, silvery-green leaflets covered in fine hairs
  • Flower: Dense terminal spikes of bright yellow pea-like flowers, 1–2 cm long
  • Stem: Erect, hairy green stems branching near the base
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Care Guide

Watering

Keep soil consistently moist during active growth and flowering

Fertilization

Light low-nitrogen feed at planting. Avoid high-nitrogen fertilizers which may promote leaf growth over flowering

Eggshell powder topdress:Crush dried, rinsed eggshells into fine powder; sprinkle 1 teaspoon around the base of each plant and water in lightly to release nutrients
Pruning
  • Deadhead spent flower spikes to prevent unwanted self-seeding in managed gardens
  • Remove yellowing lower leaves to improve airflow and reduce disease risk
  • Trim back leggy stems in mid-spring to encourage bushier growth and more flower spikes
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; ingestion may cause vomiting, diarrhea, lethargy, and seizures in severe cases

Humans: Contains toxic alkaloids; ingestion causes nausea, vomiting, and muscle weakness in large quantities

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Garden Uses & Culture

Culture: Symbolizes imagination and cheerful energy in some European folk traditions

Usage: Ornamental wildflower; nitrogen-fixing cover crop to improve soil fertility