Is periwinkle plant a shrub

Yes, the periwinkle plant, specifically Vinca minor and Vinca major, is often classified as a herbaceous perennial, but it can exhibit shrub-like characteristics, especially when it grows in dense mats. While it typically has a low-growing habit, it can reach heights of about 12 inches and spread widely. In some contexts, particularly in landscaping, it may be considered a ground cover or low shrub due to its sprawling nature. However, it is not a traditional woody shrub like those in the family of true shrubs.