I let a Strawberry Pie Auto in door (fast buds) go for 19-20 weeks ,conclusion -if you let Autos go longer they will throw a few seeds(not a lot but enough not to buy for a couple of years ), I stopped feeding approx 12 weeks then just ph water does the trick -more than enough nutrients in the plant, let them cannibalise them self's does no harm to the buds( couch lock for visitors).. try it see what happens its a weed, they do what they need to do to survive - they do in the bush no different