Isopogon formosus (Rose Coneflower)
Not only the showiest of the Isopogons but also one of the easiest to grow. Each Spring the ends of each stem erupt into purple fireworks. The flowers persist for weeks with a steady succession. Tip pruning when young will create a fuller plant and a good haircut after the flowers are spent will force new growth from lower down the stems. This creates a bigger flower show each year.
Full sun, good drainage, and air flow are key to a happy plant. If left unpruned, it can grow to 6' and look rangy. Pruning keeps it looking much tidier and you should aim for a height of around 3-4' by about as wide. Hardy to at least 24f with tip damage.