New Grower first grow questions??

[greenthumb#1]

Hi everyone this is my first grow, ive got 4 critical jack autos from dinafem. They have been growing for 40 days and have just started showing the first signs of flowering. Is this normal as ive read elsewere that it should have started earlier on in the grow ? I have also done a bit of low stress training as space is limited. I have been left with a healthy green canopy covering the space entirely but i have just noticed that the shaded leaves at the base of the plant are yellowing and falling off. Is this normal? If not why has this occured and how can i solve the problems. Have attached some photos also

IM using a 600watt hps light with the light cycle 20/4 in a 1.5m. L x 1.0 w x 2.0 h with A 4inch inline extractor fan a 4imch inline exhaust fan and a 6inch oscilating fan

cheers for any info
peace!

 

[namvet25]

I see no pictures.I'm growing critical jack now and they showed sex at 21 days.Try and repost pics and i'll try and help you.Also I need to no about your nutes,your ph, and anything else you are adding.

 

[epenguin]

Same here bruv, I have Critical on the go and it showed well early, like Namvet.
If you have a good canopy then it is likely that the lower leaves are not getting enough light and so are yellowing. That sounds natural. A couple of low slung cfl's would help if you think it is a problem. But as our esteemed friend says PIC's are needed to really be of help.
Good luck pal, eP.