As you gain experience you can tell.. but if you're new the only thing you can really go by is an "exotic" smell, lighter and more limey green is always a plus, and basically the amount of white hairs and orange hairs coming out of the bud.

Pic of what good bud looks like:
http://upload.wikimedia.org/wikipedi...7/ST-3-bud.jpg
Dutch Masta Reviewed by Dutch Masta on . How to tell if your weed is good or not Could some people post here and give me some tips as to knowing if the weed you buy is good or not? (smell, look, ect.) Rating: 5