Goldthorn Farming in Scarlet Monastery Cathedral (Classic - WoTLK)
Goldthorn is a great source of income and can be farmed easily by anyone that is at least level 50. All you need to do is leave a character logged out in Scarlet Monastery Cathedral with at least 150 Herbalism to gather Goldthorn periodically throughout the day. You will be able to gather the herb 5 times an hour before you max out your instances per hour that you're allowed to farm. It typically takes under 15min to grab 5 instances of herbs, leaving you plenty of time to do other stuff inbetween.
There are two nodes of Goldthorn that spawn inside of SM: Cath, one in the first courtyard and the other once you go up the stairs and into the other courtyard. In addition to the Goldthorn inside SM Cathedral you'll also find a spawn of Liferoot too. It's up to you if you'd like to grab that herb too - I don't see any reason not to!
Goldthorn Spawn Locations
For the sake of argument, above you can find a picture with all of the locations I have seen for Goldthorn in Cathedral. Now, it's not like it is hard to look at your mini map and track them down but some people prefer visual aid when it comes to things like this. If Goldthorn can spawn on one side of the map generally it will spawn on the other side of the map in the same location, exception being in the first courtyard I've never seen a spawn identical to "4".
The only other thing of value that you will find here is Silk Cloth from the Scarlet NPCs when you need to kill them to get them away from your Goldthorn. Besides that there isn't much of value. Now you may say, well what about the Liferoot? I don't even bother with it, it sells for like 20s each and it is hard to sell even at that low price. If you'd like to gather it, I'm not stopping you.
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