I made this Peacebloom and Silverleaf farming guide to help out players who want to farm the herbs instead of buying them from the Auction House. These are the two lowest level herbs, both requires only level 1 Herbalism, which means you can pick these herbs as soon as you learn Herbalism.
These two herbs can be found in the same zones, so I combined the Peacebloom farming guide with the Silverleaf farming guide.
Peacebloom and Silverleaf
Tirisfal Glades - Horde
Tirisfal Glades is the best zones for Horde players to farm these two herbs. There is Herbalism trainer in Brill which makes this place even better.
Elwyn Forest - Alliance
Alliance players should go to Elwyn Forest. One big circle in the zone and all herbs will respawn by the time you get to the point where you started.