This so often the case; the received wisdom does have good sense to it, but sometimes the rules can be thrown away. So it can be with flower photography, when usually I would aim for a bright overcast day, after rain being even better as the droplets look fantastic on the leaves and flowers. However, let's not dismiss full sunlight completely as sometimes the rich, dense colours produced can have a different sort of effect, no less beautiful and actually sometimes very uplifting.
Here are some examples of full sun flower images, shot mainly in Scotland.