Balloon Flower (Platycodon grandiflorus): Growing Guide for 'Sentimental Blue'

Balloon flower (Platycodon grandiflorus), also called Japanese or Chinese bellflower, is a clump-forming perennial native to East Asia. Its name comes from the inflated, balloon-like buds that pop open into star-shaped, five-petaled blossoms in shades of blue, purple, pink, or white. Low-maintenance and long-lived, it adds whimsy to borders, rock gardens, and containers.

Growing Conditions

• Zones: 3–8.
• Light: Full sun to part shade.
• Soil: Fertile, well-drained, slightly acidic.
• Spacing: 20–25 inches apart.
• Planting Time: Early spring after last frost.

Care

• Water: Weekly during growing season; keep soil moist but not soggy. Mulch to retain moisture and protect roots in winter.
• Fertilizer: None first year; apply slow-release nitrogen fertilizer in second spring.
• Deadheading: Remove faded flowers to encourage rebloom into fall.
• Handling: Wear gloves—stems exude a milky sap that can irritate skin.

Propagation

Sow seeds indoors 6–8 weeks before last frost, or direct-sow after frost. Germination in 10–21 days. Transplant seedlings when true leaves appear.

Landscape Uses

Excellent in perennial borders, cottage gardens, patio containers, hanging baskets, and as edging. The unique buds delight children and adults alike.