I've searched on here a lot. I've grown now, I can comfortably say, enough. I'd say 4 or 5 whole "crops". I've only grown crappy bud once, and it was because I couldn't afford to replace the crappy lights I decided to buy.
You will only need nutrients if you plan to grow in the same pot of soil you planted the seed in, and only if that pot is 6 inches in diameter or smaller. If you are growing in a pot that is taller than the plant you intend to grow, you will probably need barely any nutrients. If you plan on transplanting your plant twice or more into soil that has nutrients built in, you do not need to add nutrients.
I just plant the seed, water it. When I start seeing either yellowing leaves, or slow growth, or lots of roots sticking out of the bottom of the pot, then I will transplant or fertilize.
I grew my current grow, from February to June starting in soil without nutrients, fertilized them once, put them in soil with nutrients, gave them some fertilizer from a free sample 3 times over the course of 3 weeks, after they had already been in that soil for a month, then they got one watering with molasses, other than that, just water.
They are in 3 gallon pots, and have been doing just fine.
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The mixes of products at the grow shop are very name brand, but any plant fertilizer adds to the plants available nutrients as long as its not overdone.