http://www.durgan.org/ShortURL/?EHJRJ 15 July 2008 Echinacea, Purple Coneflower The "rocket' flower rises every year, and spreads slightly. I always look for its return each year.
Yes, My experience indicates that they grow slowly, but they appaar every year, and the cluster gets slowly larger. The flowering head stays for almost a month or more. I always like to look at them. I have a particularly large cluster now.