Plumbago auriculata could be talked about on so many different threads - plant of the day, drought tolerance, unsung heroes, even friend or foe. I could never really work out why some days the flowers seemed pale and some darker and some other people's plants were such a deeper blue than mine usually are. I thought it must be down to different selections/hybrids. Then, after a few days of torrential rain mine are a stunning blue. Perhaps water is the answer?