Species Specific > Shimpaku Juniper Bonsai Discussion

my only shimpaku

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John Kirby:
Vance, I checked Dirr and yes the vast majority of Junipers are Dioecious, with some individuals being monoecious ( typically a small percentage). Where the problem lies is in your translation of dioecious, where you state dioecious means both sexes on same plant. Actually, monoecious means, one house, both sexes reside in same individual and dioecious means, two houses, where the sexes are separate and distinct. Quoting Dirr's definition of dioecious (5th Edition, Manual of Woody Landscape Plants, Glossary page 1132): "Dioecious: having unisexual fls.,each sex confined to a separate plant, said of species."

So those who state they have male or female Junipers are most likely stating the truth. For example, with California Junipers only about 2% are thought to be monoecious, haven't seen one yet in Bonsai.

John Kirby:
A nice online definition of Dioecious.


I too, believe it is good to confirm your sources and reference appropriately.

Am I wrong?

It seems you are correct.  However how do you account for the presence of both parts on some of these Junipers?

John Kirby:
Vance, some percentage of junipers have both sexes on the same plant. Typically, these are small proportions of the population, a few percent. I don't know if you do cuttings or gound layers on a branch with one gender type if the new plant will show both sexes on the new plant or not, but I think it should. The California Juniper number is about 2% of all plants appear to be monoecious, one could expect other species of junipers to be similar.

John Kirby:
One note, the definitions of Dioecious and Monoecious are absolutely correct, as is the general rule that Juniper species dioecious.

As with most rules, there are exceptions. It appears, according to at least one reference, that Juniperus osteospermum (Utah Juniper) that being monoecious is the norm. I have requested the reference and will share what it says.


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