Perennials

Platycodon grandiflorus 'Astra Blue'

Astra Blue balloon flower

cultivar photograph. Platycodon grandiflorus 'Astra Blue' Balloon Flower. Surrounding plants are not included.

Puffed buds open into violet-blue stars above a compact green mound. Well suited to small borders and containers. Avoid disturbing the thick root; division is rarely needed.

At a glance

Sun: Full sun to part shade
Mature size: 8–10 in. tall × 12–16 in. wide
Water: Average to moist; well drained
Hardiness: USDA zones 3–9
Bloom: Violet blue; summer.

Sizes & prices

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Catalog updated September 8, 2026. This is not a live stock count; please call to confirm availability and price.

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Resistance & tolerances

Deer: Resistant, not browse-proof.
Drought: Water during dry spells.
Wet soil: Moist, well-drained soil; avoid standing water.
Clay soil: Suitable with appropriate drainage.

Resistance is not a guarantee; deer and rabbits may browse any plant.

Growing & care

Spring: Mark its spot; shoots emerge late.

Sources & photo credits

Perennials.com

NC State Extension

Photo: Cindy Christian · CC BY 4.0

Image notes: cultivar photograph. Platycodon grandiflorus 'Astra Blue' Balloon Flower. Uncropped. Surrounding plants are not included.

Reviewed September 19, 2026. Growing conditions vary by location.