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Yellow loosestrife
Also known as: Garden yellow loosestrife
Yellow loosestrife (Lysimachia vulgaris) is an herbaceous perennial that will grow from 91 to 183 cm tall. It blooms from summer to fall with yellow cup-shaped flowers that have reddish-brown centers. Considered a noxious weed in some regions it is an aggressive plant that can spread by underground roots and profuse self-seeding.
Scientific classification
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Perennial
Lifespan
Herb
Plant Type
Late spring, Summer, Early fall
Bloom Time
Green
Leaf Color
2 cm to 8 cm
Flower Size
Yellow
Flower Color
Green, Yellow
Stem Color
Deciduous
Leaf type
5 - 32 ℃
Ideal Temperature

Images of Yellow loosestrife

Distribution of Yellow loosestrife

Distribution Map
Yellow loosestrife is native to temperate regions of Europe and Asia. It has been introduced and naturalized in various parts of North America and Australasia. This perennial herb is adaptable to a range of habitats and is also cultivated in regions beyond its indigenous range.
Native
Cultivated
Invasive
Introduced
No species reported
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Habitat
Marshes, Streams
Hemisphere Trend Curve

Culture

Garden Use
Yellow loosestrife is a popular ornamental in northern temperate gardens, perfect for areas with very wet soil, or along streambanks. Dense clusters of bright yellow flowers, tinged with orange at the base, add a splash of vibrant color during the summer months, especially when this plant is grown in drifts.
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Toxicity

Yellow loosestrife contains saponins, causing mild toxicity to humans, cats, and dogs. Ingestion leads to gastrointestinal distress, including nausea, vomiting, and diarrhea, and irritation of mucous membranes in humans. Cats and dogs experience similar symptoms. All parts of yellow loosestrife are toxic. Immediate veterinary care is crucial if pets show signs of poisoning to ensure their well-being.
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Care Guide for Yellow loosestrife

Every week
Water
Partial sun
Sunlight
5 - 32 ℃
Ideal Temperature
Water: Yellow loosestrife thrives in humid environments, preferring moist conditions with a balanced watering routine. Water yellow loosestrife weekly, adjusting during flowering for higher moisture needs due to increased activity.
Fertilize: For healthy growth and vibrant blooms in yellow loosestrife, apply a balanced fertilizer in spring and a high phosphorus blend before flowering. Monthly applications during the growing season are recommended, with reduced frequency in autumn. Adjust care based on seasonal changes, and avoid over-fertilizing to maintain vitality.
Pruning: Yellow loosestrife, with its bright yellow flowers and vigorous growth, thrives with early to late spring pruning. Cut back dead stems and thin overcrowded areas for better air circulation. Regular post-bloom pruning extends the flowering period and rejuvenates the plant for the next season.
Propagation: Yellow loosestrife thrives in moist, fertile loamy soils and is primarily propagated by sowing. For successful germination, seeds should be lightly pressed into the soil, requiring light but not covering. Yellow loosestrife can self-seed in suitable conditions, benefiting from consistent humidity.
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