Answer: The Nellie Stevens often fruits adequately without a male, this is one of the reasons it has been so popular. Most of the named cultivars of Chinese holly (Ilex cornuta) are female, so you could simply use a male plant of the straight species if you feel your Nellie Stevens is not fruiting heavily enough on its own. The Foster hollies are numbered, with Foster's #4 being a male selection. Ilex opaca "Greenleaf" could be planted with any male American holly (Ilex opaca), including the straight species. When you purchase a holly, you should find that it is offered along with suitable pollen source. The main criterion is that they need to bloom at the same time. Your local nursery should have a selection of male hollies available in the spring. And, if you live in a neighborhood where many hollies are growing already, you may not need to plant your own male trees. I hope this helps.
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