 | Astra Double Blue Balloon Flower. Blue Balloons All Summer Astra Double Blue Ballon Flower, Platycodon 'Astra Double Blue', is a wonderful new dwarf variety! 'Astra' Platycodons are a new series that form compact, well-branched plants.This heavy bloomer gets its name from the way each flower bud swells before its starry petals unfold. The interesting balloon-like buds burst open into bell-shaped double blue flowers from mid summer through early fall. Its compact, uniform habit makes 'Astra Double Blue' a good selection for cut flowers,... - Astra Double Blue Balloon Flower. |