This Deadnettle farming guide will show you the routes I use for farming Deadnettle in Wrath of the Lich King Classic.
Deadnettle does not spawn in its own nodes but instead is a random drop from picking other Northrend herbs, specifically Goldclover, Tiger Lily, and Talandra's Rose.
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Howling Fjord, Borean Tundra, and Grizzly Hills are the best zones for farming Deadnettle in WotLK Classic. There is not much difference between the three.
If you don't have a flying mount, I recommend skipping the parts around Utgarde Keep in the middle.
Borean Tundra is not much worse than Howling Fjord, I just prefer the layout of Howling Fjord.
The route is easy to follow, and the herbs will start respawning by the time you do a full lap, but Grizzly Hills has a bit more Tiger Lily than Borean Tundra and Howling Fjord.
Zul'Drak is also a good place for farming, you will get a bit fewer herbs, but you will get Talandra's Rose instead of Goldclover and Tiger Lily.