Lupin
Lupinus polyphyllus
flowerLupins are tall, stately perennials with striking spires of densely-packed flowers in rich jewel tones and pastels. They have distinctive palmate foliage and are nitrogen-fixing plants that improve soil fertility naturally. These dramatic blooms are magnificent in cottage gardens and cut flower arrangements.
Common Problems
Select the problem your Lupin is experiencing to get a treatment guide.
Care Guide
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Light
Full sun to partial shade (minimum 5–6 hours sun daily) for robust growth.
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Water
Water regularly to keep soil consistently moist; good drainage is critical. Drought-sensitive; mulch to retain moisture.
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Soil
Prefers slightly acidic to neutral soil (pH 6.0–7.0). Must have excellent drainage; tolerates poor soil.
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Fertiliser
Light feeding; excess nitrogen promotes foliage at expense of flowers. Avoid high-phosphorus fertilizers.
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Temperature
Prefers cool conditions (50–70°F); struggles in hot, humid climates. Hardy to zone 3.
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Humidity
Moderate humidity preferred; excellent air circulation essential to prevent root rot and fungal disease.
Toxicity
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All parts contain quinolizidine alkaloids; toxic to cats, dogs, and children. Keep away from pets and small children.
Common Diseases
Common Pests
Seasonal Care
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Resume regular watering and feeding as growth picks up.
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Peak growing season. Water and feed regularly.
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Reduce watering as growth slows. Stop heavy feeding.
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Minimal watering and feeding. Protect from frost if needed.