Holly Flower

This was a special day for us; we were allowed to leave the house for exercise, although we had to stay within 5 km and avoid contact with other people or objects.
There are a few holly trees in the hedgerows surrounding our forestry, some have berries every year and some don't.  I am endeavoring to find out whether the non-berried ones are merely too immature or male. I am watching the flowers closely, so that when they open my questions will be answered.