American Holly (Ilex opaca)

For the past few months, I keep wondering why the Holly shrub didn't produce red berries like those in our neighborhood. This spring, we start to get some green berries, possible it will turn red soon?

American holly (Ilex opaca) and unknown purple flower

This unknown purple flower is planted same pot with the American holly.
The holloy tree didn't produce red berries like most of the shrub, possible it needs another female plant in order for it to yield berries?