About how old till u can tell whether your plant is a female or male

Im interested in the average tell of the plants sex

4-5 weeks if your lucky. some won't flower till you switch to 12/12 and then you still have to wait. Almost always I've had males show up first BTW.

I've also heard 7-9 weeks as well. I don't got the space to wait that long so i just flip the switch accordingly

i just planted mine 1 week ago and there about three to four inches tall but what is the best thing to water them with and after thay get 7-8 weeks and still can tell if its mall or female what should i do

what does he mean by 12/12

Distilled water only. 12/12 is the light cycle for flowering. U can change the light cycle to 12 on, 12 off whenever u wish to make the plant flower. right now u should have it under 24 hour light, or 18 hours.

my plants didn't show signs in 7-9 weeks and they grew too big for my grow room

Bro what is the actual dimensions of ur flower space? You can manipulate ur plants or force to flower when ever you want them to. From seed I veg mine to 10 inches. Some strains tripple in size with towering colas while others double.
Males usually sex first showing lil balls beneath the nodes and start always at the top.Females show pistils usually after males but have had them show in as lil as the first 3 days of flower but can take up to a 14 days but usualy the average is 11(12/12).
Ur veg to flower time is going to depend on ur flower room hieght.Have enuff space for ur plants to grow at least 3 X the size they were when u switched to flower mode,when growing an unknown strain. I veg and clone @ 18/6.
Hope this helps