so you planted outdoors in mid april, it will more than likely be mid July before you can sex them. I've had plants 10 feet tall and I could not tell if they were male or female. Now you can guess and go ahead and pull that 10 foot plant, but that if you're wrong:eek:.
As far as flower goes it really depends on the light, not how long it's been alive.
there's alot better stuff to use for fertilizer than 101010 bro, do some research..
good luck with your grow, give "em plenty of light, water and good dirt and you'll be alright. and don't take anybody out there.