You Will Get 10 Seeds Catharanthus Roseus Madagascar Periwinkle Or Vinca. This plant goes by the names Madagascar Periwinkle as well as Vinca, but do not confuse this with the vining groundcover that also goes by the name Vinca, as this is very different from that.. This is a beautiful perennial in warm regions or annual in cooler climates, that gets pinwheel shaped flowers in various colors, but mostly shades of pink to lavender, and glossy green leaves.. They are hardy to at least USDA zone 8b, and possibly colder but are widely grown as annuals in colder areas.. These plants would make excellent additions to your rare plant collection, or just make a unique statement in your yard.