Platycodon grandiflorus, commonly known as the Balloon Flower or Chinese Bellflower, is a beautiful late-blooming perennial admired for its color and shape. The Balloon Flower is blue — an uncommon color in any season. As its buds mature, they inflate into the shape of balloons, which swell and color until they open to reveal star- or bell-shaped flowers.
The Balloon Flower is a very genial plant. In its native Asia, it is typically found in open grasses by hills and mountains. It enjoys full sun but is also very cold hardy. The Balloon Flower is seldom bothered by insects and seldom bothers its neighbors, i.e. it doesn't spread. The Balloon Flower is easy to grow and more reliable than most blues. Its bloom occurs in July and August, adding a welcome burst of color to the late summer garden.
Because it's a late bloomer, you'll want to mark your Balloon Flower locations. If you're starting from seed, don't expect flowers until the second year. Impatient gardeners can start with container-grown plants. If starting outdoors, plant seeds just after the last winter frost. If indoors, sow pots 6 to 8 weeks before last frost.
The Balloon Flower enjoys well-drained, well-fertilized soils. First rains can make the stems a little floppy, so consider adding stakes. Add 2 inches of mulch during summer. Light deadheading can extend bloom time.
Use Balloon Flower for unexpected color in a perennial border. If used as cut flowers, sear the stems with a match or candle immediately after cutting.