Answer: There are two different plants called Periwinkle. One is Vinca minor, an glossy leaved evergreen groundcover with blue flowers in the spring. This plant is perennial and is very low maintenance. If covered by a very thick, heavy layer of fallen leaves in autumn you might rake or blow those off. Otherwise it requires virtually no care.
There is also a summer blooming flower called Madagascar periwinkle, Catharanthus roseus. It has blooms in white or shades of pink to red. This flower will be killed by winter cold in your area and can be pulled out in late fall after frost.
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