I am a totally new to growing, my first grow will start in about 2 weeks and was curious could I just use coco a&b for the entire grow or would I need other nutes?
You also need cal mag as the coco is free from it and is not buffering them.
Except for that coco related particularity you can use only A+B saw nutrients and cal mag as additive
Best is to keep nutrient regime to as simple as possible you will get less deficiencies that way
What does it say on the bottle?
if it says for growth and flowering fine use it