Biggest one is a stable environment .I'm planning on doing a auto grow when this one is done ,the reason my grow room is the most stable so I will want to get all of my outdoor photos in there from may to June .
If the temp swing is to much it slows the plant down,if they dry out it slows them down ,anything else that will slow them as well .Basically if you grow in your living space then your environment should be great and autos should do great if you grow in your cellar like me well good luck