Potato cactus is an item that is a secondary ingredient when creating magic potions.
There are a total of 10 spawns in the Kalphite Lair:
, Note: Prior to a player entering the Kalphite Lair, it is highly recommended they bring along a few antipoison potions, as Kalphite Soldiers and Kalphite Guardians are poisonous. Kalphite workers and the Kalphite Queen, however, are not poisonous – but be warned that the Kalphite Queen is level 333 and has very dangerous magic, range and melee attacks that have a max hit of 31.
This item is also a reward from Nightmare Zone. This item is not available to purchase by Iron Men.