when will my plants start pre flowering?

i have two bagseed plants growing outdoors in the UK. there about 7 weeks old and i was woundering if any one could tell me when i should start looking for there sex.
this is it>

That's totally strain and growing environment dependent. Some show early and some never show, until put into flower. Looks like you have 5 sets of alternating nodes. I'd say one more set and you should start seeing some signs. G.L.

if you're in the uk you're plant wont flower until september cause thats when it goes to 12/12 lght for buds but it will have good veg time. just hope its a indica or indica/sativa cross

Preflowers, as opposed to full blown flowers, generally appear after the fourth week of vegetative growth from seed. Check carefully above the fourth node.

the widow man why hope that there indica or indica/sativa cross?

thanks mogie i checked today and there is somthing begining to grow on the forth node. will this be new leaves or branches or will it be pre-flowering?
i would take a photo but my camra canot focud that close.

i never had preflowers they just started showing pistils and leaves