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Lobelia
Lobelia speciosa is a hybrid developed from three lobelia species: L. fulgens, L. cardinalis, and L. siphilitica. Lobelia speciosa flowers come in several colors, such as pink, red, or lavender. It's a popular garden plant that particularly attracts hummingbirds and butterflies.
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50 cm to 1 m
Plant Height
10 cm to 50 cm
Spread
Green, Red, Bronze
Leaf Color
2.5 cm to 5 cm
Flower Size
Pink, Purple, Red, Blue
Flower Color
Semi-evergreen
Leaf type
0 - 32 ℃
Ideal Temperature

Culture

Garden Use
The deep red, purple, or pink, upright flower clusters of lobelia promise to bring visual refreshment to a sunny summer garden. The aesthetics of this plant work great within beds, borders, and containers in cottage, coastal, or city gardens. Thriving in wet soils, lobelia is also a good choice to plant near ponds and streams.
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Toxicity

Lobelia is moderately toxic to cats and dogs. Ingesting any part of lobelia can cause vomiting, diarrhea, tremors, excessive drooling, rapid heart rate, and weakness. Immediate veterinary attention is essential if poisoning is suspected.
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Care Guide for Lobelia

Every week
Water
Full sun
Sunlight
0 - 32 ℃
Ideal Temperature
Garden Soil
Soil Type
Water: Lobelia thrives in moist habitats, requiring consistent hydration and evenly moist soil. Weekly watering is essential for lush growth and blooms. As an herbaceous perennial, it benefits from rainwater, supporting its high humidity needs and reflecting its natural rainfall patterns.
Fertilize: To ensure healthy growth and blooms, fertilize lobelia with balanced fertilizer early in the season, then switch to high phosphorus before flowering. Apply every 4-6 weeks, adjusting for seasonal changes. Dilute fertilizer to half strength to prevent root burn.
Pruning: Lobelia exhibits vibrant blooms and rich foliage. To promote health, prune in early to late spring, focusing on spent flowers and damaged stems. Pinch back new growth for bushiness. Clean, sharp tools minimize damage, encouraging robust growth and an extended blooming season.
Propagation: To propagate lobelia, cut a healthy stem at a node, apply rooting hormone, and plant in well-draining soil. Keep the soil moist (not soggy), provide indirect light, and maintain consistent warmth. With care, cuttings develop strong roots, resulting in vibrant plants.
Repotting: Repot lobelia every 2-3 years in spring using a pot 1-2 inches larger. After repotting, provide moderate water and avoid direct sunlight for a week to aid recovery. Fresh soil supports its growth, allowing the plant to thrive in a spacious environment.
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