· John Heider's Answer
· Hi Janice-Both the 'Southern Gentleman' and 'Apollo' are late blooming male selections that can be used as pollinators for 'Sparkleberry' holly. The 'Sparkleberry' is a hybred introduced by the US National Arboretum. 'Apollo' is a male selection of the same cross also introduced by the US National Arboretum as a pollinator for 'Sparkleberry'.
The advantage of using both 'Sparkleberry' and 'Apollo' holly is that they are both adaptable to wet and dry locations. They are good companions as they both will survive in a wide range of soil types and amounts of sun and shade conditions.
There is nothing I can find as far as one of these pollinators being superior over the other. The 'Apollo' is good for the late flowerers like the 'Sparkleberry' and the 'Southern Gentleman' is best if you are trying to pollinate possibly other selections at the same time.
Hope this answered your question - John)