im growing 8 plants right now in a 2x4x5 tent. With the way shit is going right now, i hope to get around an lb dry off of my grow. 2 oz per plant aint too much to ask.
If your using a growtent, that cant be the only factor in determining what your yield could potentially be. You need to factor in your lighting system, your ventilation, wether your going to use co2, nutrient regimen, additives, and everything else that comes along during a grow, unexpected or otherwise. My plants are only gonna end up being almost 2 feet tall, not including the growbag which is about a foot, so 3 feet total. They are a week into flowering, and still going through the stretch.
The advantages of growing in a growtent, are that you have your own personal greenhouse, and if you decide to grow in a closet or something like that, its contained even inside the closet, so you dont need to worry about negative pressure in your grow area, or having to lightproof everything. IT all takes care of itself, and all you have to worry about is proper ventilation and lighting. If your tent is 2 1/2x2 1/2 x 5, then id say you could probably fit 4-5 plants in there pretty snugly. If your growing with an HID (like a 400w MH/HPS digital setup), you could potentially get 10 oz off of your grow if you do everything in optimal conditions. What i would do if i were you, would be to expect low numbers, that way your not disappointed if you get like 3/4 - 1 oz off of each plant.
and always remember that YIELD IS NOT EVEN CLOSE TO AS IMPORTANT AS THE QUALITY OF THE BUD
happy growing!!
-K1