Sometimes  referred to as periwinkles: these are hardy little plants that flower almost all year long. If they do die due to a freeze, they come back as soon as spring starts. A physician friend told me the chemotherapy agent vincristine is extracted from one member of this plants family. It is used to treat some types of leukemias, lymphomas, and childhood cancers. Not only a pretty flower, but quite useful as well.

They will spread and take over an area if you are not careful.

 

 

FOG sez: My kind of plant; put it in the ground once and it keeps on growing.