Also just to add a little here from my own very limited experience. I use GH nutes. I haven't been growing for long and a lot of advice I've read here is that they are a good starting nute for the first timer but there are better ones. I grew my first Cali Orange about a year ago with them and it did just fine. Had some problems at first and ended up with only female but she grown nice and strong. Had a good bush with a fairly decent crop for my first time.

My one piece of advice when using the GH (as I'm sure with other programs) get Cal-Mag. You will need this additive. As you do more you can experiment with adding others but you will need this for sure now.