The butterflies were so busy that they were still there when I came back.
There butterflies are what we call Cabbage White butterflies because they lay their eggs on cabbages and other members of the cruciferous family. Today they were experiencing the delights of my Kiss-me-quick flowers. What a lovely old-fashioned name. These flowers had grown in my grandmothers garden 100 years ago. They are strong and hardy and are very drought tolerant.
The butterflies were also visiting a yellow rose. These butterflies are also called Summer Snow in some parts.
The Latin name of Kiss-me-quick is Centranthrus ruber. It is called other names including valerian, red valerian, Jupiter's beard, Keys to Heaven, Fox's bush and spur valerian.
For more information about this plant see this article
Centranthus ruber in Southern Australia