Several years ago I bought 3 Holly bushes at a small nursery. They were not marked male-female. As a result, I must have either 3 males or 3 females b/c they do not bear fruit...the small red berries. One did not make it through the winter so I will be replacing it. I'd like to get one of the opposite sex of the ones I have so they can do the "cross pollination thing" and get some berries. (that should be fun to watch!!! ) Anyway, how do I tell what sex of hollys I have?