You can tell Juniperus is feminine (grammatically) by such epithets as
"sabina" and "virginiana".
In the classical languages trees are feminine by default,

Thanks for the clarification. I'm still a gardener (shudder!). Having a copy of
Stearns doesn't make me an expert.

Dirr claims Broadmoor is staminate

I know he does. Is he infallible like the Pope? He also says it is green. These
are bluish, which is how the clone is described on the Web. And they have
berries,

Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)