A grimy toadflax is a herb that has not yet been cleaned to make a toadflax. Grimy toadflaxes are grown from a toadflax seed with a Farming level of 38. Each herb grants 38.5 Farming experience when harvested. This is a great way to make a profit through farming, as toadflax seeds are inexpensive. Cleaning a grimy toadflax requires a Herblore level of 30 and gives 8 Herblore experience. Clean toadflaxes are used to make agility potions, antidote+, and saradomin brews with Herblore levels of 34, 68, and 81, respectively.
Grimy toadflax is one of the five herbs that cannot be obtained from the Sorceress's Garden minigame. They can, however, be purchased with Agility arena tickets at the Brimhaven Agility Arena or with points at the Pest Control minigame. One of the few monsters that drops toadflax is the Tree spirit.