Balloon flower 'Misato Purple' is a clump-forming perennial native to slopes and meadows across China, Japan, Korea, and Siberia. Its name captures the magic of its buds, which puff up like tiny balloons before unfurling into outward-facing, bell-shaped flowers with five pointed lobes in shades of purple-blue, each bloom reaching 2 to 3 inches across. Hardy in zones 3 through 8, this cultivar grows 6 to 12 inches tall with a spread of 12 to 18 inches, blooming generously from June through November. Starting from seed, balloon flowers reach full bloom in approximately 84 days, and they thrive in full sun to partial shade with moderate water and minimal maintenance.
2
Full Sun
Moderate
9-9
72in H x 36in W
—
Moderate
Hover over chart points for details
The real draw of balloon flower lies in the drama of its unopened buds, which genuinely resemble tiny inflated balloons suspended on wiry stems before bursting into star-shaped blooms. Purple-blue flowers appear singly or in small clusters throughout the summer and into fall, making each plant a long-season performer. Deer leave it alone, it handles dry spells well, and its flowers earn their keep as exceptional cut flowers. Pollinators flock to the blooms, turning your garden into a hub of activity without you lifting a finger beyond occasional deadheading.
Balloon flower serves primarily as an ornamental perennial, prized for its dramatic and extended bloom period from June through November. The flowers excel as cut flowers for fresh arrangements, holding their delicate star shape well in water. In containers and garden beds, the compact growth habit fits seamlessly into mixed borders and cottage gardens. Beyond ornamental use, the plant can be grown as an annual in colder regions, and roots can be harvested after 2 to 3 years in East Asian culinary and traditional medicine applications.
No timeline data available yet for this variety.
Start seeds indoors 6 to 8 weeks before your last frost date. Surface sow seeds and cover them with a light sprinkling of vermiculite. Maintain temperatures between 65 and 70 degrees Fahrenheit. Seeds typically sprout in 7 to 21 days.
Transplant seedlings outdoors after the last frost has passed. Harden off seedlings gradually before moving them to the garden to acclimate them to outdoor conditions.
Direct sow seeds outdoors after frost danger has passed, though starting indoors provides stronger early growth.
Deadhead spent flowers regularly throughout the bloom season to encourage continued flowering and extend blooms through November. Beyond deadheading, pruning is not necessary for this compact, clump-forming perennial. In late fall or early spring, you may remove any dead stems, but generally leave the plant undisturbed since transplanting and division are difficult due to the fragile root system.
Enter your ZIP code to see a personalized growing calendar for this plant.
“Balloon flower belongs to an ancient horticultural tradition in East Asia, where it has been cultivated for centuries. In its native regions, the plant holds cultural significance beyond ornamental value, with roots harvested after 2 to 3 years of growth. The species was eventually introduced to Western gardens, where it gained recognition as a reliable perennial. The 'Misato Purple' cultivar represents ongoing efforts by plant breeders to refine and stabilize desirable traits within Platycodon grandiflorus, honoring the plant's long history while offering gardeners a dependable, specifically selected form.”