Platycodon grandiflorus ‘Astra Double Blue’

('AStra Semi-Double Blue', Balloon Flower)


Hardiness Zones:

 3a  3b  4a  4b  5a  5b  6a  6b  7a  7b  8a  8b

Quick Overview:

Balloon flower is a clump-forming perennial that is so named because its flower buds puff up like balloons before bursting open into outward-to-upward-facing, bell-shaped flowers with five pointed lobes. The Astra series of balloon flower consists of a variety of different seed-grown forms including single, semi-double and double flowers in white, lavender, blue and pink. Astra series plants reportedly are more vigorous plants with better seed germination rates and better flowering. ‘Astra Double Blue’ is a dwarf/compact cultivar that produces fluffy, semi-double, blue flowers (to 3″ across) singly or in small clusters atop stems typically growing to only 6-12″ tall with a spread to 8″ wide. Flowers bloom throughout the summer. Ovate to lance-shaped, toothed, blue-green leaves.


Best grown in light, medium moisture, organically rich, well-drained loams in full sun to part shade. Avoid wet or poorly-drained soils. ‘Astra Semi-Double Blue’ is easily grown from seed. Division and transplanting are possible but tricky because of the fragile, fleshy root systems of these plants, and it is probably best to leave plants undisturbed once established. Deadheading spent flowers generally prolongs the bloom period. New season plant stems emerge late in spring, so gardeners must be careful not to damage crowns by early cultivation (leaving old plant stems in place throughout winter to the point when the new growth first appears helps mark plant locations). Staking is usually not necessary because of the short stems of this compact cultivar.  (Courtesy of Missouri Botanical Gardens Plant Finder)

Additional information

Common Name

'AStra Semi-Double Blue', Balloon Flower

Botanical Name

Platycodon grandiflorus 'Astra Semi-Double Blue'


1 gallon

Evergreen or Deciduous


Hardiness Zone

3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b

Growth Rate


Light Requirements

Part-sun, Sun


1 ft.


1 ft.

Soil Condition


Water Needs


Blooming Period

spring and summer

Flower Color




Foliage Color


Deer Resistant


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