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not totally true. theres a level of required care in order to make amazing buds, but its doable without much work as well. and remember, 95% of the plant problems on this site were caused by giving the plant TOO MUCH attention.
to answer your questions:
1) it will grow as big or small as you let it. if its watered properly, given minimal amounts of fertilizers, and given full days of direct sun, itll grow to be a massive, hearty beast. however, you can use training/pruning to keep this to whatever hieght you desire. (outdoors expect 3-7 feet with minimal care and training)
2)if you harvest 1-2 weeks early, your buds wont be as potent. if you harvest 3-6 weeks early, you may have trouble just getting a buzz.
Ummm, hows he gonna let it get big or small? U want him to go outside and cover it with a tarp when its sunny??? Is that how he keeps it manageable?? I dont grow ouside, but im sorry i dont think he can manage the size of a plant as easily as u presume, when mama sunshine is beeting down on little baby MJ plant. :fish: