Grimy fellstalk is a high-level herb, obtained by growing a fellstalk seed, requiring level 91 Farming (giving 225 experience for planting the seed and 315.6 per herb harvested). It can then be cleaned into a clean fellstalk at level 91 Herblore, giving 16.8 experience.
Cleaning grimy fellstalk yields a profit/loss of 668 coins per herb.
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