Cessation of flowering is caused by lengthening the day, not shortening it. So, no...

A cloudy / overcast period during the day won't shorten the photoperiod, anyway. It doesn't take much light for a plant to sense that it's "daytime."
DreadedHermie Reviewed by DreadedHermie on . Days too short to finish? I have a young lady who looks as if she could use another 2 weeks. The only problem is she is only getting about 7 hours of sun on good days, it is cloudy a lot. It is cooling off here around 50f at night, but mid to upper 70's during the day. So here's my question...Is this enough sun to help my little lady finish or should I call it? Thanks for any help. Rating: 5