This article is about the grimy herb. For the cleaned herb, see Guam leaf
A grimy guam leaf is a herb that has not yet been cleaned to make a guam leaf. Grimy guams may be grown from a guam seed with a Farming level of 9. It is dropped by certain non-player characters. Cleaning a grimy guam requires an Herblore level of 3 and gives 2.5 Herblore experience. Clean guams are used to make Attack potions at level 3, Guthix rests (requires 2 clean guams) at level 18, and guam tar at level 19.
There is also a grimy guam leaf that spawns in the Deep Wilderness Dungeon.
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For an exhaustive list of all known sources for this item, see here