Green Druid - Which roots to use?

[Tethler]

I don't remember a duration difference between these when I leveled my blue druid, but that was years ago. Test it out and see if it really does drop early. Downranking root isn't a terrible thing to do if you are doing something mana intensive anyway, so if you go that route it should be fine to just use the lower one. The damage is nice though on the higher roots.