What is the fastest spreading perennial?
Perennial geranium perennial geraniums, also known as cranesbill geranium due to the shape of the flowers, are a type of hardy groundcover that spreads rapidly. Rozanne® cranesbill. Known as the geranium of the millennium, rozanne® cranesbill can bloom for over 3 months, filling your garden with flowers all season long. The 2008 perennial of the year, rozanne has long been proven to keep your garden flowering for as long as possible.