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Platycodon grandiflorus 'Astra Blue'
Astra Blue Balloon Flower has masses of beautiful blue bell-shaped flowers with white eyes and purple veins at the ends of the stems from early to late summer, which emerge from distinctive navy blue flower buds, and which are most effective when planted in groupings. Its narrow leaves remain dark green in color throughout the season.
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Astra Blue Balloon Flower will grow to be about 12 inches tall at maturity, with a spread of 12 inches. When grown in masses or used as a bedding plant, individual plants should be spaced approximately 9 inches apart. Its foliage tends to remain dense right to the ground, not requiring facer plants in front. It grows at a medium rate, and under ideal conditions can be expected to live for approximately 10 years. As an herbaceous perennial, this plant will usually die back to the crown each winter, and will regrow from the base each spring. Be careful not to disturb the crown in late winter when it may not be readily seen! This plant does best in full sun to partial shade. It prefers to grow in average to moist conditions, and shouldn't be allowed to dry out. It is not particular as to soil type or pH. It is somewhat tolerant of urban pollution. This is a selected variety of a species not originally from North America. Astra Blue Balloon Flower is a fine choice for the garden, but it is also a good selection for planting in outdoor pots and containers. It is often used as a 'filler' in the 'spiller-thriller-filler' container combination, providing a mass of flowers against which the thriller plants stand out. Note that when growing plants in outdoor containers and baskets, they may require more frequent waterings than they would in the yard or garden.
Height
12 inches
Width
12 inches
Exposure
full sun to partial shade
Water Needs
average to moist
Hardiness
Zone 3a-3a
Growth Rate
medium