A male pollinator can enable six female producers to fruit.

These signals stimulate mating behavior in the male pollinators, which then attempt copulation, called "pseudocopulation", with the orchid labellum (Schluter et al. 2009).

But if the waxy grey fruits are to be had, remember that the female plants are the ones to choose with a few male pollinators in the vicinity.

Deciduous hollies have three different bloom times, so hybridizers have developed certain male pollinators that bloom at the same time as the female plants.

Remember that there must be sufficient male pollinators in the vicinity to be sure of good berry set for the winter season.

(Remember it is the female plant that has berries; a male pollinator is needed.)

Remember, that if holly berries are to be sought for fall, there must be a male pollinator nearby.

Skimmia females need male pollinators to produce berries but I would settle for Skimmia reevesiana "Rubella" (male) for its attractive red flower spikes - it makes a compact shrub.