Myrtle ground cover, also called Vinca minor and periwinkle, optimally grows 3 to 6 inches tall with dark green evergreen foliage and flowers that bloom in April. This plant can mound, however, to 2 feet tall, which can produce a messy look. To keep myrtle ground cover in check, trim it. Knowledge of when and how to go about this will give you an attractive and adaptive ground cover.
Time your trimming properly. Myrtle ground cover blooms in the spring and produces blooms for the next year in summer. To preserve the blooms, trim the plant right after spring flowering.
Sterilize your lawnmower blades. Wipe them down with rubbing alcohol and a rag. Set the mowing deck to cut at a height of 4 to 6 inches.
Mow over the myrtle ground cover, making sure not to miss any spot. This can be done annually, but the plant needs trimming only every two or three years for optimum growth.
Clear out debris that remains from mowing. Rake over the ground cover. Throw out any plant materials to decrease the spread of disease the myrtle may possess.