It's dry in the Karoo. The word Karoo doesn't mean "Place of Thirst" for nothing. But the smallest amount of rain in the last winter of early spring means that there will be flowers. And flowers there were when I drove through the Karoo Heartland late in September. On the road north of Steynsburg I had to double take when I suddenly saw fields of yellow flowers and just could not help but to pull over and take out my camera.
Yet another example that you don't really have to go to the West Coast to see flowers in spring.