Answer: Let's answer the easy part of your question first. Each year the flowers that your female holly produces need to be pollinated by the male in order to produce berries. If no male is near, the plant will flower but the blossoms will fall off instead of developing berries. Each year each new flower must be pollinated in order to produce fruit.
Since you have both a male and female Blue Prince, you'll have a reliable crop of berries each year. Ilex kornuta 'Burfordii', your Burford Holly, is self-fertile and does not require pollination for fruit set. In fact, this holly has a reputation for setting a heavy crop of fruit yer after year.
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