From the moment the first male flower opens and sheds pollen. Can be anywhere from a week after they appear to a couple weeks.

Best to isolate or eliminate when you first notice. 7 days is a pretty small window, and you can't be sure that you saw them at first emergence. If it is suspect, better be safe than sorry.
irydyum Reviewed by irydyum on . HELP -- Is this a male plant? I am 9 weeks into veg and up to now thought I had all females but now I see these little balls. This plant has the little hair/spikes all over it but just in this one area little balls. Is this a male plant? :mad: Rating: 5