Strange leaf colour? Saturday puzzle?

As Annikki and I walked around the Kampitie garden yesterday evening, truly enjoying it in all its glory, Annikki pointed to some leaves which had a strange colouration.



She said that she had not seen this earlier. It was now visible on different plants leaves.

Any of you have a clue for this strange purplish coluring?

Annikki thought it was possibly due to the high UV in the sunshine at these latitudes which is also the reason for a high incidence of skin cancer here!











The flowers are still continuing to bloom and the garden is most colourful although we are fast approaching the end of summer and moving into the autumn in about a month's time. The temperatures have been sizzling but rain is expected tonight and possibly ground frost tomorrow morning!