Annual Baby's Breath (who the heck named it that?) blooms for a short time beginning in very early summer.  It grows 2¼'-2½' tall in my garden.  It self-seeded itself the first time I planted it, so I figured it was a hardy annual.  When it didn't come up the next year, I found out that is actually a tender annual.  Most sources list it as such, but some still list it as hardy.  I might try growing this again sometime.