Still no pre-flowers? :[

ive got 18 plants from seed in a greenhouse in my back yard (using sunlight) none of them have shown any preflowers yet and their close to 2 months old. these are just a couple pictures a few are quit a bit taller than these

heres another one

They look a lot like one of mine, I have one that's sativa dominant and it alternated nodes a few weeks ago and still has no pre-flower, mine used to be a lot more compact but one took of growing a foot a week and one stayed a little 10'' bush.

they are outside it wont show preflowers until later in the season when the days get shorter

also to show flowering it has to be in 12 hours of light 12 hours of dark

ide like to get them sexed asap. for the past 4 days ive been using 3 buckets and putting 3 plants under each bucket at 7pm and taking them off at 7am. will this work? and how long should it take?

also most of them probaly need to be transplanted into bigger pots so they can grow more, but im limited on money to buy soil and i didnt wanna transplant them till i knew which were the females

bumpbumpbump

aaaaaaahhhhhhhhhhhhhhhhhhhhhhh

They may not flower if the bucket dosen't give them air intake how would you fell if someone put a bucket just as big as you over you for half a day? You would suffocate probably.

well the ground isnt 100% level so it gets air from the bottom but idk if thats enough?