Widely popular among gardeners, Platycodon grandiflorus (Balloon Flower) is a compact herbaceous perennial with bell-shaped, flaring, violet-blue flowers, up to 2-3 in. Blooming throughout summer, the upward facing blossoms are held singly or in small clusters atop upright, branched, leafy stems.Click to see full answer. Hereof, do balloon flowers come back every year?Balloon flowers (Platycodon grandiflorus) live up to their names, with the buds appearing to inflate before they burst open to reveal their bell-shaped summer blooms. These perennials grow in U.S. Department of Agriculture plant hardiness zones 3 through 8, where they thrive in full-sun garden beds.Also Know, do balloon flowers spread? Balloon flowers make great neighbors to other plants because they don’t spread and only need dividing about once a decade. do platycodon come back every year? Platycodon grandiflorus Plant Facts Astra Double balloon flower plants in 5-inch pots are available from Nature Hills Nursery. Platycodon ‘Astra Double Blue’ is a hardy disease- and pest-resistant perennial that blooms all summer.How do you take care of a platycodon plant? How to Care for a Platycodon Plant Watch for the balloon flowers to sprout in the spring. Apply a complete plant food after new growth appears. Water the plant regularly but be careful not to overwater it. Use plant stakes or circles to support taller varieties of balloon flowers.