The deep blue, fragrant flowers cover the bush from June through September. The flowers form on new growth, so even when in dies back in the winter in colder climates, you can expect a great summer show next year. Blue Puffball only grows 3’-4’ tall and wide. It fits perfectly in your border or in your bed. The round shape lends itself to just about any pot style, too, so buy a couple to flank your front door and have the most talked-about entryway in the neighborhood.