I think The environment in which the plants find themselves, is the most influential thing effecting the plant itself.
If I had a property where I could grow, which was totally dialed in and environmentally controlled, I could develop a more laid back, set it and forget it type mentality. But having said this, lets look at my current situation.
I have four clones. All bought from the same dispensary at the same time. They have all been in the exact same environment from the beginning. They are in the same room, same water, same pH, same PPM, same light....every factor is identical.
So why then are there three clones just sitting there dormant, while the forth is growing, well....like a weed?
I also think the geographical location plays a huge factor. Try growing in the following conditions.
Room size 11x9x10'hi.
Uninsulated roof which is simply plywood with metal on top. (HOT)
No ventilation.
Two 600w HPS w/ballast in the room, as well as veg lights.
Daytime temp outside, 110f, night time 85-95f
Humidity 80%
One small 110 AC unit
In 2006 at this location it was 103f in April.
These conditions usually continue through September.
I'm not trying to be a braggart here. This was my grow room for about five years.
In these conditions, I guarantee you, you will encounter a myriad of problems. It would be great to know off the top of ones head, how to correct any and all potential problems before they raise their ugly head...but how are you supposed to know the problem is coming before it presents itself? And unless you have become a marijuana botanist prior to any growing, how are you going to know how to treat the problem without diligent study, on forums such as this? Is this not why we're here?
http://buymarijuanaseeds.com/community/threads/home-made-aero-v2-0.121146/
Here is a link to a thread I started years ago on another forum. It represents almost a year of growing in the grow room above. I think it started in Dec. and ended in Sept., or Oct.
Check it out.