Arenaria is an alchemy ingredient in The Witcher 3: Wild Hunt that is needed to craft the following items:
- Enhanced draconid oil
- Superior draconid oil
- Fiend decoction
- Hanged Man's Venom
- Enhanced Hanged Man's Venom
- Katakan decoction
- Enhanced necrophage oil
- Superior necrophage oil
- Superior ogroid oil
- Petri's Philter
- Enhanced Petri's Philter
- Superior Petri's Philter
- Specter oil
- Enhanced specter oil
- White armor dye
- White Gull
It can be found as random loot, guaranteed in the chest during A Dog's Life, gathered from plants, or purchased from the following merchants:
- All herbalists except Yolar
- Gremist at Gedyneith
- Jonna in Rannvaig
- Keira Metz
- Merchant in the Fish Market in Novigrad
- Merchant in the shop in Gildorf
- The Pellar near Blackbough
Arenaria plants in the base game can be hard to find outside of White Orchard, where it is most easily farmed in the fields between the sawmill and Woesong Bridge. It is much more prevalent in the Hearts of Stone expansion.