okay well is there a reason why only 25?
bcuz if u have a solid 6x6 grow area with no other junk in the way, thats 36 sq. ft.
i would do at least a plant per sq. ft. in one gallon pots (2 gal. spaced 1 per sq. ft. would be a lil better imo)
i would also suggest a soilless medium like readygro or something like that and to water/feed everyday if possible, but thats just my style. everyone grows different.
i use plain coco personally. but i suggested readygro or likewise cuz i believe u can use a wider range of nutrients with it and its probably a bit less complicated and expencive nute wise.
for sativa flip'em over to 12/12 around 5-8 inches
indicas prolly 6-10
thats to keep them small like you want and just a rough guideline, it really depends on your strain.
i was just thinking the math would be even so like 16= 4x4, 25= 5x5, but i guess i could do 6x6 =36, but i wasn't growing for commercal reasons so i didnt need that much, i just wanted to keep my stash good until next harvest without doing a perpetual harvest type of thing (i think its better to just grow all you need then just start over after you harvest, working from clones instead of taking up space trying to setup your grow to har. every 2 weeks, but thats just me) and the way i smoke i would need about 3oz's a month. so i figure that a harvest take about 4 months to go from seed to harvest the frist time around you have to include sexxing, then revegging, then over vegging to get enough clones, then puting them into 12/12, then harvesting, but each har. after that should only take about 3 month or less ( just take clones from the plants in there last 3 wks of 12/12, by the time they are ready to root , the fower roomshould be ready to har).
how does that sound?
still kind of perpetural. but not like some of these guys on here they got a harvest every 2 - 3 wks going, ive never tryed it but it sounds like it takes up to much space when you could just grow all you need at one time