I'm still waiting for my cafe au lait to open, but it is showing more purple like the colour you have there. I thought I had mixed them up, but maybe its the weather.
It's not clever nature, just a genetic mistake. If you were to culture the local petal tissues you would get pure creamy-white and pure purple flowers, perhaps a mix, never the almost exact 45º slice.
location: Surrey Hills, England, ex-woodland acidic sand. "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
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"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."