Make sure you always have enough for your Healing Potions.
Harralander is a necessary resource to brew all sorts of potions in RuneScape: Dragonwilds, but most notably it's featured in Healing Potions. Healing Potions are a necessity to have in your inventory once you start progressing further in the map and story, so you'll need plenty of them to survive the harsher parts of the game. Of course, your ability to craft Healing Potions might be hindered by the fact that Harralander is quite hard to come by.
Like other herbs in RuneScape: Dragonwilds, Harralander is located in the swamp region of the map. However, it's not overly common in the region, and it can be difficult to see, as it has the same color as the surrounding flora and fauna. Fortunately, you can farm Harralander in Dragonwilds, but only if you know where to look.
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Farming Harralander in RuneScape: Dragonwilds
First and foremost, let's start by going over where Harralander is located on the map.
You can only find Harralander in the Whispering Swamp region, which is located directly north of Bramblemead Valley and south of Fractured Plains. It's a fairly harmless region, but there is an Abyssal Demon roaming around the center of it and plenty of goblins and rats to keep you on your toes. This is also where Cathan and the blue door is located for the main questline.

In the Whispering Swamp, you're able to find two herbs by looting them on the ground. One is Marrentill and the other is Harralander. Marrentill is a bright green colored-herb, while Harralander is a bluish-green herb, making it much more difficult to see on the ground. You'll also find that Marrentill is far more common than Harralander in the Whispering Swamp.
So, how do you go about farming Harralander? Well, the simple answer is to make a massive loop around the Whispering Swamp, going in and out of the small islands that border the river that runs through the region. As long as you're checking all of the solid ground surfaces in the swamp, you should be able to loot roughly 15-20 Harralander.

What about after that, though? Fortunately, after a few in-game days in RuneScape: Dragonwilds, all of the Harralander will reset, allowing you to go back and re-loot all of the ones you previously looted. This means as long as you keep returning to the Whispering Swamp every few days, you'll be able to continuously farm the same Harralander over and over. You'll also have a much better idea of where the Harralander is located the more you return, as you're picking the same herbs in the same locations.
That's by far the easiest way to ensure you never have a short supply of Harralander in RuneScape: Dragonwilds. You're also able to find more advanced herbs in a region called Bloodblight Swamp, but that swamp requires you to make a special potion survive in.
Now that you have your Harralander, you're free to brew all the Healing Potions you want back at your Brewing Cauldron.
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