It seems that most Viola species that produce cleistogamous flowers do so
throughout the growing season but produce the showy flowers only for a short
season, mostly in the spring. Trying to get them NOT to produce
cleistogamous flowers would be difficult.


Iris Cohen wrote in message
...
My face is red. You know how we tell all these wet-behind-the-ears high
school
students with their term papers to do a Web search first. Well, just for
the
heck of it, I tried searching on "viola flowering mechanism" and sure
enough, I
found an article on chasmatogamous vs. cleistogamous flowering in violets.
However, the researcher was vague on what causes the difference, so if
anyone
has further information, I would like to know.
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)