During leveling noticed that some of items that begins quest are not working as it should. Apparently it says "You don't meet requirements for that quest". http://www.wowhead.com/item=57935/harvest-watcher-heart --> This is one of such items.
I'm pretty sure that's only because you're not supposed to drop it before completing a certain quest.
Once you're done with the right quest, you should be able to get the quest.
During leveling noticed that some of items that begins quest are not working as it should. Apparently it says "You don't meet requirements for that quest". http://www.wowhead.com/item=57935/harvest-watcher-heart --> This is one of such items.