Blue Balloon Flower (Platycodon grandiflorus) is a hardy perennial admired for its unique balloon-shaped buds that burst open into star-like blue blossoms. Compact and reliable, it is perfect for borders, rock gardens, and containers. Easy to grow and long-lived, Balloon Flowers bloom in summer, attract pollinators, and return year after year with minimal care.
Seed Information
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Type: Flower Seeds
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Common Name: Blue Balloon Flower, Chinese Bellflower
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Genus: Platycodon
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Species: Platycodon grandiflorus
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Life Cycle: Perennial
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Features: Unique balloon-shaped buds, star-shaped blue blooms, pollinator friendly, long-lived perennial, ornamental
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Season of Interest: Summer blooming
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Indoor/Outdoor: Both (outdoor borders, containers, rock gardens)
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Sunlight: Full sun to partial shade
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Cultivating Difficulty: Easy to moderate
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Watering: Moderate, prefers well-draining soil
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Climate: Temperate, Humid Subtropical, Mediterranean
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Growth Habit: Upright clumping, 12–24 in tall
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Soil Type: Well-draining loamy or sandy soil
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Soil pH: 5.8–7.5
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Planting Time: Spring after frost or late summer
Grow Instructions
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When to Plant: Sow indoors 6–8 weeks before last frost or directly outdoors after frost danger has passed
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Soil: Well-draining sandy or loamy soil with neutral to slightly acidic pH
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Sunlight: Full sun to partial shade
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Watering: Keep evenly moist but avoid waterlogging
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Spacing: 12–15 inches apart
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Germination: 14–20 days at 65–70°F (18–21°C)
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Bloom Season: Mid to late summer
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Tips: Balloon flowers are slow to emerge in spring—be patient; avoid disturbing roots once established