Cemmorhan

From wow.incgamers.com

Cemmorhan is a level 30 Herbalism trainer. He is located in The Vault of Lights on the Exodar on Azuremyst Isle. He trains Apprentice through Artisan Herbalism. You can find out more about Herbalism by clicking here. Or to find out how to use your Herbalism skill in a more advanced way, click here.