Well if you have a strain like ak-47 you could very well get up to a quarter ounce. I dought you will get a amount like that on your first grow.
It all depends on what strain, conditons, ect. I will be more than happy to help you if you post a picture of your grow area. I could help you customize it to full potental. If you are uncomfortable or don't have a camera for that that is just fine.
I suggest making a journal.
Oh, and i'm no perfessional but 2-2 1/4 feet tall in vegging then to flowering is the best idea, I can think of for 4 foot plants. Feel free to personnal message me at any time.
Try to not over water or cause your plants stress. (Esv. moving or handling // ex. touch alot!) What type of light or lights are you using.
One more thing make sure!!!!!!! you have proper venting. In my grow room my fresh air hole is lower towards the floor and my exhaust is towards the top. (Cold air floats low/ Hot air rises)
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