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More rain-splashed blue flowers for this week – though the reverse of the flower of Geranium ‘Rozanne’ is more of a purple-blue. A lot of supposedly blue flowers are, like this, not quite blue. I’ve just read that the reason for it is that plants don’t have any true blue pigments.
So how do plants like forget-me-nots and borage make their flowers look so blue? Apparently the colour comes from the chemical manipulation of the anthocyanin pigments that create reds. From the point of view of the plant, it’s worth the extra effort because the eyesight of bees is especially responsive to blue.
If I’d done a bit more science at school I might have known about this. That slight pinkish tint in many blue flowers has always intrigued me. Now I know why it’s there. (And now you know how I’ve been passing a rainy afternoon on the internet!)
Knowing that it is less easy for flowers to appear blue makes me appreciate the blue flowers in my garden even more. These pretty flowers of Geranium Rozanne have held up well in the recent rains; now that the sun is shining again I’ll make sure to get out and enjoy the sight of them.






















