to answer your question yes, right away. the best nutes i have found for MJ is a combination that i make myself.
Directions
In a bucket add:
2cups of water, 1/4cups sea salt, 1/4cup soy sauce, 1/4 cup bleach, 1/2 cup red cordial. mix and heat in microwave for 7.5minutes, remove and pour straight over your plant.
your light schedule, hours of light/dark. what are you using now 24/0 18/6 12/12? when you switch to 12/12 it tells the plant when its time to start producing bud
you could put it at 12/12 now and it should be flowering within a week or two
do you know what strain it is? or is it just some bagseeds? how old is it?
a few tips for when you do switch to 12/12
during dark time it needs to be COMPLETELY dark and you need alot of light during light time. light leaks will increase the chances of your plant turning int a hermaphrodite and ruining your crop. what are you using CFLs? what wat are they and how many?
second yes you do need a light schedule your plant will freak out if this is changed alot, what ever time it comes on that time needs to stay the same you can change the length its on but only when you go to flower then use 12 on/12 off it works the best
next do alot of research on google itll be your best friend when it comes to growing, youve already found a good site to get help but alot of people give newbs hell ya kno what i mean....
strains are the different types of weed as in , northern lights, kush, popcorn, lowryder, white widow, and many many many many more