For Plant Care Instructions: www.mygardenchannel.com Vigorous and floriferous, Platycodon grandiflorus 'Astra Double Blue' (Balloon Flower) is a dwarf herbaceous perennial which produces an abundance of fully rounded balloon shaped buds which change into beautiful blue flowers. Zones 3-8 as a Perennial flower. Grown in our Zone 6 Flower Garden, dormant in the winter. Shipping now via USPS Priority mail