Hi Rez,

Some squash plants only produce male flowers, I don't know why, but
I've seen this enough times to know it happens. Frex, I planted
three
zucchini last year, all from the same seed pack, and only two ever
had
female blossoms. The third had nothing but male blossoms.

If I'm not wrong, the main stem will just give male flower. So it can
be the third does not develop side stem.

I'm not good in English, but I do hope you understand what I try to
say.

Regards,
Wong