The plumbago plant (Plumbago auriculata), also known as the Cape plumbago or sky flower, is actually a shrub and in its natural surroundings can grow 6 to 10 feet (2-3 m.) tall with a spread of 8 to 10 feet (2.5-3 m.). It is native to South Africa and knowing this provides the first clue to how to grow plumbago, along with where to grow one.