In several places in our yard, we have violets growing in great abundance. They can be very invasive, but we like them so we don't find them intrusive. They can be mowed, just like lawn, and they are really beautiful to behold. The plants are bright green and in past years the flowers have all been white. This year, we have the usual white, plus blue and the hoped for purple! Really pretty! They grow under the concrete driveway and have covered a lot of distance. We are thinking to plant them intentionally on the island and see how they do there.