Lobelia

Lobelia erinus

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verifiedReviewed by the GreenScout Team

Lobelia is a tender annual with tiny delicate flowers in blue, purple, pink, or white that bloom abundantly throughout the season. Its cascading or mounding habit makes it ideal for hanging baskets, containers, and borders. The flowers attract pollinators and create striking color displays even in partial shade.

Common Problems

Select the problem your Lobelia is experiencing to get a treatment guide.

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Wiltingchevron_right

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Root Rotchevron_right

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Yellow Leaveschevron_right

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Leggy Growthchevron_right

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Slow Growthchevron_right

Care Guide

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Light

Partial shade to full sun (3–6 hours sun daily). In hot climates, afternoon shade prevents stress and extends flowering.

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Water

Keep soil consistently moist but not waterlogged. Regular watering is essential; avoid drying out completely. Reduce watering in winter dormancy.

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Soil

Rich, well-draining potting mix or garden soil amended with organic matter. pH 6.0–7.0. Good drainage is critical to prevent root rot.

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Fertiliser

Feed every 2–4 weeks with balanced liquid fertilizer during growing season. Avoid excessive nitrogen which promotes foliage over flowers.

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Temperature

Prefers 60–75°F (15–24°C). Tender annual; frost-sensitive. Dislikes prolonged heat above 80°F (27°C).

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Humidity

Moderate to high humidity preferred. Mist foliage occasionally if air is very dry.

Toxicity

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Lobelia is non-toxic to cats, dogs, and children.

Common Diseases

filter_dramaRoot Rotchevron_right spaPowdery Mildewchevron_right grainLeaf Spotchevron_right

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.

Frequently Asked Questions

Is Lobelia good for hanging baskets?

Yes — its cascading or mounding habit and tiny, abundant flowers make it ideal for hanging baskets, containers, and borders, creating striking color displays even in partial shade.

Why does my Lobelia wilt in summer heat?

It dislikes prolonged heat above 80°F — this tender annual prefers 60–75°F and may need afternoon shade or extra water during hot spells to keep blooming well.