RDR 2: Pick all Burdock Root for Herbalist Challenge 7 (30 of 30 + bonus 1 near Dakota River) - YouTube
Where to Find Burdock Root in Red Dead Redemption 2 - Gamepur
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Plants - Red Dead Redemption 2 Walkthrough & Guide - GameFAQs
Burdock root : r/reddeadredemption
Red Dead Online Burdock Root Location Guide | GameWatcher
Burdock Root locations in Red Dead Redemption 2 | Shacknews
For those of y'all still playing story mode and are tired of riding around 5 hours to find 6 plants. Here's a minuscule belated Christmas present : r/reddeadredemption
Red Dead Redemption 2 Plants Locations
Red Dead Online Burdock Root Location Guide | GameWatcher
April 27th daily challenge. Easiest access burdock root using van horn fast travel, prairie chicken spawn locations. : r/RedDeadOnline