They'll be rootbound long before 3 ft. esp. in such lil containers .
Do a lil more research , and how about some pics of the enviroment you have for them , we might be able to help a lil more w/ more than just a mental pic.

100 in a 5 x 5 will never happen , muchless that large . Usually as a rule you need 1 gal. of room in a pot per 1 foot of vert. plant desired .

Peace
Crispi :jointsmile:
xcrispi Reviewed by xcrispi on . how many plants will my setup flower i currently have a 5foot by 5 foot floor plan with an 8foot hight in a walk in closet. theres a huge 2foot by 3 foot home made air cooled 400watt hps in the center with many side lights. i run 4 2foot floro tubes on the dimest lit wall spaced evenly every 1 foot, and 4 four foot floro tubes on eather side of the hps hood. a total of 520 watts. 400hps. i have many more lights to add if need be but i would like to cover every ince of floor space with plants 3 feet tall before i flower. how many Rating: 5