I planted 12 holly shrubs in front of my house in the fall of last year. I live in Maine where I am told they do well. I am new to holly shrubs and don't know much about them. I planted them in a row of 2 female 1 male, 2 female 1 male and so on. All 12 of them are flowering with little tiny white flowers right now. Is this normal or do I have a problem?