gimme sum advice

ok so i just started growing for the first time with eight plants they are all still only about 3-4 inches tall, hidden in the woods next to my home i dont think they are at any risk of being discovered you have to go through alot of mud before you get to the site which is protected by a shit load of pricker bushes and thik viney plant life. im guessin that they get about 10-13 hours of light. they are about 2 feet away from each other. i have not given them any special plant food or any thing lik that. so what im wonderin is should i give them miracle grow i have not yet because im worried that it will kill the plants or make them unhealthy to smoke. i am also wondering how many weeks it will be untill i will be able to tell the males from females(im pretty sure i can do that males have balls and females have 2 long whit hairs right?) so if any one can help out a first timer please do so thanx

Welcome Mex

These plants are in the ground not pots correct?
You can use MG.

Make sure to start out 1/2 of recomended dose.

Mix nutes with water and pour the mix in a circle around the plant.
I would say atleast 4-5" away from the plants.

Depending on the soil you may not even need nutes.

What is you general location? (part of the world for climate sake)

I would read this whole thread by Beaner If I were you.
https://www.rollitup.org/outdoor-growing/12156-beaner-has-toooo-much-time.html

Less is more with nutes.

Happy growing.