Grimy ranarr weed

A grimy ranarr is a herb that can be cleaned to make a ranarr weed. Grimy ranarr weeds may be grown from a ranarr seed with a Farming level of 32. Cleaning a grimy ranarr requires a Herblore level of 25 and gives 7.5 Herblore experience. Clean ranarr weeds are used to make defence potions and prayer potions with a Herblore level of 30 and 38, respectively. Grimy ranarrs may also be obtained from the Sorceress's Garden minigame. Grimy herbs, including ranarr, are commonly found by killing chaos druids. Killing flesh crawlers and ice warriors are also a relatively good strategy to collect grimy ranarrs.

Dropping monsters
Moss giants also drop these butt were not listed here for some reason there combat level is only 42 and can be found in the varrock sewers