Home/Plants/Large-Flowered Sweet Pea

Large-Flowered Sweet Pea

Lathyrus grandiflorus

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A perennial tendril-climbing vine producing clusters of large, showy sweet pea-like flowers in pink and purple shades with exquisite fragrance. Lathyrus grandiflorus is hardier than annual sweet peas and typically flowers reliably each year, making it an excellent choice for cool-climate gardens. The flowers are excellent for cutting and attract bees and butterflies.

Large-Flowered Sweet Pea

Common Problems

Select the problem your Large-Flowered Sweet Pea is experiencing to get a treatment guide.

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Yellow Leaveschevron_right
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Root Rotchevron_right
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Wiltingchevron_right
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Powdery Mildewchevron_right
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Slow Growthchevron_right

Care Guide

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Light
Full sun to partial shade; requires 6+ hours of direct sunlight for optimal flowering; afternoon shade appreciated in hot climates
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Water
Keep soil consistently moist but well-draining; drought-tolerant once established but flowers better with regular moisture. Water at soil level to avoid wetting foliage
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Soil
Well-draining, fertile soil rich in organic matter; slightly acidic to neutral pH (6.0–7.0); poor drainage causes root rot
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Fertiliser
Light feeding monthly during growing season with balanced fertilizer; avoid excessive nitrogen which promotes foliage over flowers
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Temperature
Cool to moderate temperatures; thrives in 50–70°F (10–21°C); frost-hardy; may struggle in hot summers above 80°F (27°C)
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Humidity
Moderate humidity; good air circulation important to prevent fungal diseases

Toxicity

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Seeds contain lathyrogens and beta-N-oxalyl-L-alpha-beta-diaminopropionic acid; ingestion of large quantities may cause lathyrism; all parts potentially toxic

Common Diseases

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Common Pests

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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.