Well they can. I'm only into my second grow and I've had my share of problems and every time my plants told me what they needed. I know I'm growing in soil which is more forgiven but I've had my set bacsk and just looked at what my plants were telling me, then looked it up on this great site and WAM!! back in business. As a newbie to other newbies just listen your plants. Thanks for all the info on this forum!!!!!!!!
Hahaha. After I read what I posted I could see why you asked that. I guess I should have written that you should look at and watch your plants because they will show you what's wrong and what they need.