Plant Profile: Vinca major

Big Leaf Periwinkle is a perennial ground cover native to Asia Minor, known for creating a thick mat of foliage. It thrives in partial to full shade and prefers rich, well-drained soil. In spring, it produces blue to violet flowers that may continue to bloom sporadically into autumn. This plant can be cultivated in containers outside of USDA hardiness zone 7 and grows taller than V. minor, making it a popular choice for naturalized landscapes.

The non-flowering stems of Big Leaf Periwinkle spread along the ground, while the flowering stems grow upright. For quick coverage in smaller areas, plant them 8 inches apart; for larger spaces, a distance of 12 to 18 inches is recommended. This plant is particularly beneficial in beds with bulbs, as its lush foliage helps suppress weeds. If you want to enjoy its vibrant flowers without the risk of invasiveness, consider using it as an annual in containers. Its trailing growth habit also makes it an excellent option for hanging baskets or window boxes.

However, it's important to note that this plant is considered invasive in several states, including those surrounding North Carolina and California. It spreads when its nodes touch the soil, developing roots, and a stem cutting can easily take root in a new location, leading to the establishment of additional periwinkle patches. When planted near streams, flowing water can dislodge stem pieces, allowing them to drift downstream and form new colonies.

**Quick Identification**

**Insects, Diseases, and Other Plant Issues:** This evergreen can spread rapidly, becoming invasive as it encroaches on neighboring beds and lawns, especially in southern regions. In areas where its growth is uncontrolled, it can outcompete native plants and disrupt local wildlife habitats. Potential pests include nematodes and aphids, while disease threats encompass root rot, leaf spot, and blight. Additionally, it is a known host for a bacterium that can lead to Pierce's disease, which is particularly harmful to grapevines.