by Droj » Thu Jan 24, 2013 1:31 am
Cotton - visible white cotton buds
Corn - visible ears of corn
Cereal - visible bright yellow ears
Cabbage - visible bright green
Sorry don't have pics. Best thing I recommend you can do is you set a timer (Enders client) for the growth time of each crop or keep periodically checking for harvest option to familiarise yourself with the final stages.
edit: growth time
Cotton/pumpkin (baby bear) - 96 hrs
Cereal/cabbage - 72 hrs
Corn (baby) - 48hrs ?