Problem: Creeping Bellflower
Campanula rapunculoides This European native has escaped from perennial gardens in northern parts of the United States and southern parts of Canada. In the lawn, it forms dense patches that spread by creeping underground rootstocks as well as seeds. If not mowed, it forms spires of pretty blue to violet hanging bell-shaped flowers in midsummer. This cool-weather perennial grows most vigorously in the cooler weather of spring
Underground stems and deep taproots make creeping bellflower difficult to kill. Control is most effective when the plant is growing actively in May and June, and again in September.