Platycodon 'Astra Blue' Single is a charming and compact perennial that brings a playful, architectural element to the garden. It is most famous for its whimsical flower buds which swell into geometric, balloon-like spheres before "popping" open into large, star-shaped blossoms of vibrant violet-blue.

Part of the 'Astra' series, this variety is specifically bred to be a dwarf powerhouse. While standard Balloon Flowers can become tall and floppy, 'Astra Blue' stays naturally petite and mounded, making it an ideal choice for the front of a border or as a "filler" in mixed containers. Its thick, leathery petals are remarkably durable, allowing the blooms to last longer in the heat of mid-summer than many other delicate perennials.

Quick Facts:

• Foliage: Clean, blue-green serrated leaves that form a neat, dense mound.

• Flower: Iconic "balloon" buds that open into 2–3 inch single, star-shaped blue flowers with delicate dark veining.

• Light: Thrives in Full to Partial Sun. In hotter climates, afternoon shade helps preserve the deep blue color of the petals.

• Growth Habit: A compact, clump-forming perennial reaching only 8–10 inches tall and about 10–12 inches wide.

• Hardiness: Extremely cold-hardy, performing well in USDA Zones 3–8.

• Landscape Use: Perfect for rock gardens, edging along paths, or as a long-blooming addition to patio pots.

Pro Tip: Platycodon is famously "slow to wake up" in the spring. It is often one of the last perennials to emerge from dormancy—sometimes not showing green until late May. Many gardeners mark the spot with a small stake or stone in the fall to avoid accidentally digging it up or planting over it during early spring garden cleanup.