Autoflowers need more root space than regular photo-dependent types of plants man. Autoflowers grow to maturity, so if their roots have more running space in the first month after the initial seedling stage, it will grow to however far spread and deep the roots get. Mycorrizol w/ endo bacteria is a good idea to give them a running start. http://www.fungi.com/mycogrow/index.htmlhttp://www.mycogrow.com